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"Nanopartikel ZnO merupakan bahan logam oksida yang memiliki kemampuan fotokatalis. Dekorasi ZnO dengan nanopartikel plasmonik diharapkan dapat menimbulkan LSPR yang meningkatkan aktivitas fotokatalitik. Pada penelitian ini emas (Au) dan perak (Ag) dipilih untuk memodifikasi ZnO sebagai material yang memiliki efek plasmonik yang dapat peningkatan medan elektromagnetik yang kuat di dekat permukaan nanopartikel. Peningkatan ini menawarkan peluang untuk meningkatkan penyerapan cahaya dan meningkatkan pemisahan muatan dalam sistem fotokatalitik. Pada penelitian ini sintesis nanomaterial tersebut dilakukan melalui RLAL. Teknik laser ablasi yang digunakan memiliki keistimewaan berupa proses yang biocompatible dengan meminimalkan penggunaan bahan kimia, namun parameter sintesis tetap dapat dikontrol dengan baik. Nanopartikel yang dihasilkan lebih murni dan memiliki permukaan yang bersih. Parameter sintesis pada penelitian ini, energi laser divariasi untuk masing-masing jenis material plasmonik, sehingga mendapatkan energi laser maksimum berdasarkan nilai uji fotokatalitik tertinggi. Karakteristik nanokomposit yang terbentuk diuji dengan UV-Vis dan TEM. Hasil penelitian menunjukkan, energi laser meningkatkan optical density ZnO dan energi band gap. Nanopartikel ZnO hasil sintesis memiliki puncak absorbansi pada spektrum UV dengan energi bandgap 3,14 – 3,3 eV dengan ukuran partikel 45 ± 15 nm, nanokomposit ZnO-Au memiliki energi bandgap 3,0 – 3,3 eV dengan ukuran partikel 42 ± 16 nm (ZnO) dan 9 ± 13 nm (Au), dan nanokomposit ZnO-Ag memiliki energi bandgap 3,26 – 3,3 eV dengan ukuran partikel 43 ± 14 nm (ZnO) dan 8 ± 3 nm (Ag). Nanokomposit ZnO-Au memiliki keamampuan degradasi RhB pada cahaya tampak sebesar 72,39% dan sedangkan ZnO-Ag 67,30 %.

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Zinc oxide (ZnO) nanoparticles are a metal oxide material with photocatalytic properties. Decoration of ZnO with plasmonic nanoparticles is expected to induce LSPR, which enhances photocatalytic activity. In this study, gold (Au) and silver (Ag) were chosen to modify ZnO as materials that have a plasmonic effect that can increase the strong electromagnetic field near the nanoparticle surface. This enhancement offers opportunities to improve light absorption and enhance charge separation in the photocatalytic system. In this study, the synthesis of these nanomaterials was carried out using RLA. The laser ablation technique used has the advantage of being a biocompatible process by minimizing the use of chemicals, but the synthesis parameters can still be well controlled. The resulting nanoparticles are purer and have a clean surface. The synthesis parameters in this study, laser energy was varied for each type of plasmonic material, to obtain the maximum laser energy based on the highest photocatalytic test value. The characteristics of the formed nanocomposites were tested with UV-Vis and TEM. The results showed that laser energy increases the optical density of ZnO and the band gap energy. The synthesized ZnO nanoparticles have an absorption peak in the UV spectrum with a band gap energy of 3.14 – 3.3 eV with a particle size of 45 ± 15 nm, ZnO-Au nanocomposites have a band gap energy of 3.0 – 3.3 eV with a particle size of 42 ± 16 nm (ZnO) and 9 ± 13 nm (Au), and ZnO-Ag nanocomposites have a band gap energy of 3.26 – 3.3 eV with a particle size of 43 ± 14 nm (ZnO) and 8 ± 3 nm (Au). ZnO-Au nanocomposites could degrade RhB under visible light by 72.39%, while ZnO-Ag is 67.30%."

"Fotoelektrokimia water splitting merupakan salah satu metode penghasil hidrogen yang paling menjanjikan. Salah satu material semikonduktor yang cocok digunakan sebagai fotoanoda untuk aplikasi water splitting adalah ZnO. Namun, ZnO memiliki beberapa kekurangan yang dapat diatasi dengan menggabungkan ZnO dengan logam mulia. Pada penelitian ini, ZnO Nanorods (NRs) disintesis dengan metode hidrotermal dan kemudian dideposisi dengan AuAg Mesoflowers (MFs) yang disintesis dengan metode wet chemistry. Hasil pengujian linear sweep voltamogram (LSV) dibawah cahaya tampak dan AM 1.5 G menunjukkan ZnO/AuAg MFs menghasilkan photocurrent tertinggi pada reaksi OER maupun HER dengan efisiensi tertinggi 0,034% pada tegangan 0,874 V vs RHE. AuAg MFs juga berperan sebagai donor elektron yang diinjeksikan ke pita konduksi ZnO sehingga dapat meningkatkan photocurrent yang dihasilkan.

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Photoelectrochemical separation of water is one of the most promising methods of producing hydrogen. One of the most suitable semiconductor materials used as photoanodes for water splitting applications is ZnO. However, ZnO has several drawbacks that can be overcome by combining it with noble metals particles. In this study, ZnO nanorods (NRs) were synthesized by the hydrothermal method and then deposited with AuAg Mesoflowers (MFs) which was synthesized by the wet chemical method. The linear sweep voltammogram (LSV) measurement under visible light and AM 1.5 G show that ZnO / AuAg MFs produces the highest photocurrent in the OER and HER reactions with the highest efficiency of 0.034% at a voltage of 0.874 V vs RHE. AuAg MFs may acts as an electron donor that is injected into the ZnO conduction band so that it can increase the photocurrent."

"ABSTRAKNanopartikel emas memiliki keamanan dan biokompatibilitas yang baik dalam menghantarkan target obat pada organ atau jaringan spesifik tertentu. Perkembangan sintesis nanopartikel emas dengan berbagai metode untuk memenuhi tujuan dalam aplikasi biomedis dan farmasi telah menjadi perhatian banyak peneliti sehingga perlu dikaji kelebihan maupun kekurangannya. Metode yang sedang banyak diteliti, yaitu metode green synthesis dan metode ablasi laser yang merupakan metode ramah lingkungan dimana dapat mengurangi toksisitas dari bahan kimia yang berbahaya. Artikel review ini meninjau ulasan mengenai sintesis nanopartikel emas yang berfokus pada metode green synthesis dengan mekanisme reduksi larutan emas (HAuCl4) oleh ekstrak tanaman dan mekanisme ablasi laser Nd:YAG pada pelat emas dalam larutan, faktor-faktor yang dapat memberi pengaruh, serta secara singkat menguraikan aplikasi biomedis nanopartikel emas. Penulis berharap dapat membantu peneliti untuk menentukan metode sintesis yang lebih baik dan efisien dalam menghasilkan nanopartikel emas dengan karakteristik yang sesuai.

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ABSTRACT

Gold nanoparticles have good safety and biocompatibility in delivering drug targets to certain specific organs or tissues. The development of the synthesis of gold nanoparticles with various methods to achieve goals in biomedical and pharmaceutical applications has caught the attention of many researchers that needs to be reviewed the advantages and disadvantages. The method that is being researched is green synthesis method and laser ablation method which is an environmentally friendly method which can reduce the toxicity of hazardous chemicals. This review article presents the review of the synthesis of gold nanoparticles which focuses on the mechanism of green synthesis method by reducing of gold solution (HAuCl4) by plant extracts and the mechanism of Nd: YAG laser ablation of gold plates in solution, influential factors, and briefly describes the biomedical applications of gold nanoparticles. The author hopes to help researchers to determine which synthesis methods are better and more efficient in producing gold nanoparticles with appropriate characteristics."

"ABSTRAK

Latar belakang Tindakan ablasi endovenous untuk varises tungkai di Indonesia mulai dikerjakan tahun 2010 EVLT dikerjakan di RSCM tahun 2013 dan MOCA dikerjakan di RSUP Fatmawati tahun 2014 Belum ada evaluasi terhadap rekanalisasi pasca tindakan MOCA dan EVLT di Indonesia Metode Studi ini merupakan penelitian deskriptif analitik dengan desain cross sectional Subjek pasca MOCA atau EVLT dengan rentang waktu 3 18 bulan pasca tindakan diwawancara dan dilakukan pemeriksaan USG vaskular pada tungkai yang dioperasi untuk menilai rekanalisasi Data sekunder praoperasi diambil dari rekam medis Dicari karakteristik klinis subjek membandingkan kecenderungan rekanalisasi pasca tindakan MOCA dan EVLT dicari hubungan antara karakteristik klinis subjek dengan kejadian rekanalisasi Data diolah dengan SPSS ver 20 0 Hasil Didapatkan 43 sampel tungkai terdiri dari 24 tungkai pasca MOCA dan 19 tungkai pasca EVLT Karakteristik subjek MOCA terbanyak usia 7 mm 13 19 tungkai Pada MOCA rekanalisasi total didapatkan 2 24 dan partial 8 24 tungkai sedangkan pada EVLT rekanalisasi total 1 19 dan partial 3 19 tungkai Hubungan antara karakteristik klinis subjek dengan kejadian rekanalisasi p 0 05 Kesimpulan Kecenderungan rekanalisasi MOCA lebih tinggi dibandingkan EVLT Tidak ada hubungan bermakna antara karakteristik klinis subjek dengan kejadian rekanalisasi secara statistik namun diameter terbesar VSM 7 mm sebelum operasi secara proporsional lebih tinggi MOCA 3 4 tungkai dibandingkan EVLT 3 13 tungkai ABSTRACT

Background Endovenous ablation for varicose vein of the limb in Indonesia has been done since 2010 EVLT has been done in RSCM since 2013 and MOCA in RSUP Fatmawati in 2014 There has not any evaluation been done for recanalization post MOCA and EVLT procedure in Indonesia Method This study was descriptive analytic with cross sectional design Subjects post MOCA or EVLT with time span 3 18 months post procedure are interviewed and USG vascular examination is done on operated limb in order to evaluate the recanalization Secondary data pre surgery are taken from medical records Clinical characteristics of the subjects are seek comparing possibility of recanalization post MOCA and EVLT procedure in order to see the correlation between clinical characteristics of subjects and recanalization Data is treated using SPSS ver 20 0Results Forty three samples were collected consists of 24 extremities post MOCA samples and 19 extremities post EVLT samples Most subjects on MOCA group were 7mm were 13 19 extremities On MOCA group total recanalization were 2 24 extremities and partial were 8 24 extremities EVLT group total recanalization were 1 19 extremities and partial were 3 19 extremities Relationship between subjects clinical characteristics with recanalization event p 0 05 Conclusion Recanalization tendency in MOCA is higher compared to EVLT There is no statistically significant assosiation between clinical characteristic of the subjects and recanalization but the highest diameter VSM 7 mm pre surgery proportionally is higher in MOCA 3 4 extremities compared to EVLT 3 13 extremities ;Background Endovenous ablation for varicose vein of the limb in Indonesia has been done since 2010 EVLT has been done in RSCM since 2013 and MOCA in RSUP Fatmawati in 2014 There has not any evaluation been done for recanalization post MOCA and EVLT procedure in Indonesia Method This study was descriptive analytic with cross sectional design Subjects post MOCA or EVLT with time span 3 18 months post procedure are interviewed and USG vascular examination is done on operated limb in order to evaluate the recanalization Secondary data pre surgery are taken from medical records Clinical characteristics of the subjects are seek comparing possibility of recanalization post MOCA and EVLT procedure in order to see the correlation between clinical characteristics of subjects and recanalization Data is treated using SPSS ver 20 0Results Forty three samples were collected consists of 24 extremities post MOCA samples and 19 extremities post EVLT samples Most subjects on MOCA group were 7mm were 13 19 extremities On MOCA group total recanalization were 2 24 extremities and partial were 8 24 extremities EVLT group total recanalization were 1 19 extremities and partial were 3 19 extremities Relationship between subjects clinical characteristics with recanalization event p 0 05 Conclusion Recanalization tendency in MOCA is higher compared to EVLT There is no statistically significant assosiation between clinical characteristic of the subjects and recanalization but the highest diameter VSM 7 mm pre surgery proportionally is higher in MOCA 3 4 extremities compared to EVLT 3 13 extremities ;Background Endovenous ablation for varicose vein of the limb in Indonesia has been done since 2010 EVLT has been done in RSCM since 2013 and MOCA in RSUP Fatmawati in 2014 There has not any evaluation been done for recanalization post MOCA and EVLT procedure in Indonesia Method This study was descriptive analytic with cross sectional design Subjects post MOCA or EVLT with time span 3 18 months post procedure are interviewed and USG vascular examination is done on operated limb in order to evaluate the recanalization Secondary data pre surgery are taken from medical records Clinical characteristics of the subjects are seek comparing possibility of recanalization post MOCA and EVLT procedure in order to see the correlation between clinical characteristics of subjects and recanalization Data is treated using SPSS ver 20 0Results Forty three samples were collected consists of 24 extremities post MOCA samples and 19 extremities post EVLT samples Most subjects on MOCA group were 7mm were 13 19 extremities On MOCA group total recanalization were 2 24 extremities and partial were 8 24 extremities EVLT group total recanalization were 1 19 extremities and partial were 3 19 extremities Relationship between subjects clinical characteristics with recanalization event p 0 05 Conclusion Recanalization tendency in MOCA is higher compared to EVLT There is no statistically significant assosiation between clinical characteristic of the subjects and recanalization but the highest diameter VSM 7 mm pre surgery proportionally is higher in MOCA 3 4 extremities compared to EVLT 3 13 extremities "

"Senyawa ester asam lemak merupakan bahan kimia yang banyak dikembangkan saat ini, diantaranya digunakan pada produk-produk kosmetika dan pangan. Di Indonesia banyak penghasil asam sitrat dan asam palmitat yang memungkinkan untuk pembuatan senyawa ester asam palmitat dan asam sitrat lainnya. Oleh karena itu, percobaan sintesis ester asam 2-heksadekanoiloksipropana-1,2,3-trikarboksilat melalui proses esterifikasi asam sitrat dan asam palmitat, yang diprediksi memiliki potensi sebagai emulgator perlu dilakukan. Asam 2-heksadekanoiloksipropana-1,2,3-trikarboksilat disintesis melalui tiga tahap reaksi. Tahap pertama mereaksikan asam sitrat dengan anhidrida asetat dalam suasana asam menghasilkan asetilsitrat. Tahap kedua mereaksikan asam palmitat dalam benzen dengan metanol menggunakan katalis asam sulfat pekat menghasilkan metil palmitat. Tahap ketiga interesterifikasi antara asetilsitrat dan metil palmitat dengan katalis natrium metoksida menghasilkan asam 2-heksadekanoiloksipropana-1,2,3-trikarboksilat dengan rendemen 72,07%. Metode analisis senyawa ester menggunakan kromatografi gas kolom VB-wax (60 m x 0,32 mm), suhu kolom terprogram 170-190ºC, kenaikkan 2ºC /menit, dan dipertahankan selama 30 menit. Pada kondisi analisis diperoleh waktu retensi asam 2-heksadekanoiloksipropana-1,2,3-trikarboksilat 39,894 menit dengan kadar 72,07%. Karakterisasi dari asam 2-heksadekanoiloksipropana-1,2,3-trikarboksilat memiliki bilangan asam sebesar 395,38 dan nilai HLB 7,625.

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Fatty acid esters compound were chemical subtance that were more developed now, that were used at food and cosmetic products. In Indonesia, many of citric acid and palmitic acid producer that possible to make another citric acid and palmitic acid esters compound. For that reason, experiment to synthesize ester of 2-hexadecanoyloxypropana-1,2,3-tricarboxylic acid was might be synthesis by esterification of palmitic acid with citric acid, that was predicted has potency as emulsifier become necessary. 2-Hexadecanoyloxypropana-1,2,3-tricarboxylic acid compound was synthesized over three steps of reaction.

First step was reacted citric acid with acetic anhydride in acidic environment yielded acetylcitrate. Second step was reacted palmitic acid in benzene with methanol catalyzed by sulfuric acid yielded methyl palmitate. Third step was interesterification of acetylcitrate with methyl palmitate catalyzed by sodium methoxide yielded 2-hexadecanoyloxypropana-1,2,3-tricarboxylic acid with rendement over 72.07%.

Method of analysis ester components was performed using gas chromatography with VB-Wax column (60 m x 0.32 mm), column temperature was programmed at 170ºC-190ºC, increased by 2ºC/minute, and held for 30 minutes. In analysis conditions was yielded retention time of 2-hexadecanoyloxypropana-1,2,3-tricarboxylic acid 39.894 minutes with levels 72.07%. Characterization of 2-hexadecanoyloxypropana-1,2,3-tricarboxylic acid has acid value 395.38 and Hydrophilic Lipophylic Balance (HLB) value 7.625."

"ABSTRAKPerkembangan nanopartikel emas dalam aplikasi biomedis sangat menjanjikan karena nanopartikel emas dapat digunakan sebagai pembawa obat yang bersifat selektif dan spesifik terhadap organ atau jaringan yang ditargetkan. Nanopartikel emas mudah disintesis melalui berbagai metode, dapat disesuaikan bentuk dan ukurannya, serta mudah dikarakterisasi. Artikel ini menyajikan ulasan mengenai sintesis nanopartikel emas yang berfokus pada mekanisme sintesis dengan metode reduksi kimia dan metode fotoreduksi yang diinduksi laser femtosecond, faktor-faktor yang berpengaruh, dan secara singkat menguraikan aplikasi biomedis nanopartikel emas. Metode reduksi kimia yang dibahas yaitu metode Turkevich, sintesis dengan NaBH4, dan metode Brust-Schiffrin. Metode reduksi kimia mudah dan sederhana untuk dilakukan, namun bahan kimia yang digunakan dapat bersifat toksik dan tidak ramah lingkungan. Metode fotoreduksi yang diinduksi laser femtosecond bebas dari bahan kimia dan dapat menghasilkan nanopartikel emas dengan ukuran dan bentuk yang dapat disesuaikan. Penulis berharap dapat membantu peneliti di bidang nanoteknologi untuk menentukan metode sintesis nanopartikel emas yang paling sesuai.

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ABSTRACT

The development of gold nanoparticles in biomedical applications is very promising because gold nanoparticles can be used as selective and specific drug carrier to the targeted organ or tissue. Gold nanoparticles are easily synthesized by various methods, can be tuned its shape and size, and easily characterized. This acticle presents a review of the synthesis of gold nanoparticles which focuses on the mechanism of chemical reduction method and femtosecond laser-induced photoreduction method, influential factors, and briefly describes the biomedical application of gold nanoparticles. The chemical reduction methods discussed are the Turkevich method, synthesis with NaBH4, and the Brust-Schiffrin method. Chemical reduction methods are easy and simple to do, but the chemicals used can be toxic and not environmentally friendly. The femtosecond laser-induced photoreduction method is free of chemicals and able to synthesize gold nanoparticles with tunable size and shape. The author hopes to help researchers in the field of nanotechnology to choose the most appropriate method.

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"ABSTRACT

Laser induced thin film production (LITFP) technique was employed for making plumbum (Pb) thin film by nitrogen laser deposition in miniature scale. The energy of nitrogen laser operated at 12.5 kv, 90 torr was 3.5 mj with 5 ns pulse duration, thus producing peak power at around 0.7 MW. Pb plasma of 1 cm diameter was generated in each laser bombardment, producing thin film above the glass substrate.

The thin film characteristics were measured by means of their thickness and surface morphology using scanning electron microscope (SEM). It was proved that there was a linear relationship between the number of laser shots and film thickness."

"Metilen biru merupakan limbah industri yang menjadi perhatian penting karena warnanya yang susah terdegradasi. Pada penelitian ini, digunakan nanopartikel ZnO termodifikasi Au ZnO-Au NPs sebagai fotodegradasi metilen biru. ZnO-Au NPs disintesis menggunakan bahan yang ramah lingkungan yaitu dengan memanfaatkan daun ilalang Imperata cylindrica L yang difungsikan sebagai sumber basa, reduktor sekaligus capping agent. Proses terbentuknya nanopartikel ZnO-Au dianalisis menggunakan alat Spektrofotometer UV-Vis Ultraviolet-visible , DRS Diffuse Reflectance Spectroscopy, PSA Particle Size Analyzer, PZC Potential Zeta Charge, FTIR Fourier Transform Infra Red, XRD X-ray Diffraction, SEM Scanning Electron Microscopy, EDS Energy Dispersive X-ray dan TEM Transmission Electron Microscopy. Sintesis Nanopartikel Au pada cahaya ruang menggunakan prekursor HAuCl4 7x10-4 M dan konsentrasi ekstrak 3,46 menunjukkan hasil yang terbaik dengan puncak absorbansi 1,779 dan stabil selama 40 hari. Berdasarkan hasil XRD didapatkan ukuran kristalit AuNPs sebesar 14,47 nm. Hasil TEM menunjukkan kehomogenan dengan partikel berbentuk kubus. Ukuran partikel dari PZC yaitu -18,2 mV dan adanya peregeseran puncak serapan dari bilangan gelombang 3356 cm-1 menjadi 3394 cm-1 menandakan adanya interaksi terbentuknya nanopartikel Au.

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Methylene blue is critical industrial waste because its color is difficult to degrade. In this research, Au modified ZnO nanoparticles ZnO Au NPs was used for methylene blue photodegradation. ZnO Au NPs was synthesized using environmental friendly substance that is Imperata cylindrica L leaf extract, which has the role of base source, reduction and capping agent. The formation of ZnO Au NPs was analyzed using UV Vis spectrophotometer Ultraviolet visible , DRS Diffuse Reflectance Spectroscopy, PSA Particle Size Analyzer, PZC Potential Zeta Charge, FTIR Fourier Transform Infra Red, XRD X ray Diffraction, SEM Scanning Electron Microscopy, EDS Energy Dispersive X ray and TEM Transmission Electron Microscopy. Au nanoparticles synthesized at room condition using HAuCl4 7x10 4 M precursor and 3,46 leaf extract, showed the best result with the absorbance peak of 1,768 and was stable for 40 days. AuNP crystallite size of 14.47 nm was characterized using XRD. TEM showed, the homogenity of the particles have cubic shaped. PZC showed 18,2 mV and the band shift from 3356 cm 1 to 3394 cm 1 showed, the interaction due to Au NPs formation. "

"Dewasa ini, banyak penelitian yang dilakukan tentang proses difusi, umumnya termotivasi oleh proses difusi pada minyak dan difusi antara cairan. Di samping itu, meningkatkan sensitifitas dan kinerja dari sistem pengukuran pembelokan sinar laser adalah sebuah topik yang menarik dalam penelitian bidang material dan instrumentasi. Dalam penelitian ini, sistem pengukuran kurva pembelokan sinar laser dibangun untuk menentukan koefisien difusi antar cairan, dan bekerja dengan baik berdasarkan metode eksperimen Wiener. Larutan NaCl dan air dituangkan pada sel difusi dan setelah itu ditembakkan dengan sinar laser yang membentuk garis dengan sudut 45 terhadap vertikal pada layar. Sinar laser pada layar diambil gambarnya dengan kamera, lalu diproses. Pemrosesan gambar dan kalkulasi telah dilakukan untuk menentukan gradien indeks bias dan koefisien difusi. Koefisien difusi dari NaCl yang didapat pada penelitian sesuai dengan nilai koefisien pada literatur.

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Nowadays, a lot of research have been done about the diffusion process, generally motivated by the diffusion process in oil and between liquids. In addition, improving the sensitivity and performance of laser beam deflection measurement system is an interesting topic in materials and instrumentation research. In this study, diffusion coefficient measurement system based on laser beam deflection constructed to determine diffusion coefficient of liquid liquid material, and worked well based on the Wiener experimental method. The Sodium chloride and water solution are poured into the diffusion cell and then illuminated by the laser beam that forms a line tilted 45 to the vertical. The reflection on screen captured by camera and processed. Image processing and calculation have been performed to determine the refractive index gradient and the diffusion coefficient. The diffusion coefficient of Sodium chloride is found in a good agreement with coefficient values specified in the literature."

"Material Seng Oksida ZnO adalah salah satu material semikonduktor yang sedang banyak diteliti untuk aplikasi devais optoelektronik dan fotokatalis. Dalam penelitian ini, komposit nanorod ZnO dengan nanopartikel emas disintesis diatas substrat kaca menggunakan metode ultrasonic spray pyrolisis dan hidrotermal serta diaplikasikan sebagai fotokatalis untuk mendegradasai metilen biru. Nanopartikel emas dideposisi dengan metode hidrotermal dengan variasi suhu deposisi yaitu 90, 100, 110 dan 120 C. Hasil karakterisasi menggunakan Ultraviolet-Visible Spectroscopy, Diffuse Reflectance Spectroscopy, Photoluminescene PL, X-Ray Diffraction, Transmission Electron Microscopy TEM, dan Field Emission Scanning Electron Microscopy FESEM menunjukkan bahwa nanopartikel Au tumbuh berbentuk bulat berdiameter 5-15 nm, bersifat polikristal dengan struktur kristal cubic. Nanopartikel Au paling optimum ditumbuhkan pada suhu 110 C karena dapat meningkatkan efek fotokatalitik yang paling tinggi. Nanopartikel Au bertindak sebagai electron sink yang dapat menghambat terjadinya rekombinasi elektron dan hole sehingga dapat menghasilkan muatan bebas yang lebih banyak untuk reaksi fotokatalis. Kata kunci : Au nanopartikel, fotokatalitik, seng oksida nanorods, Au/ZnOMaterial Seng Oksida ZnO

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Zinc Oxide ZnO material is one of the most studied semiconductor materials for optoelectronic devices and photocatalys applications. In this study, the composite of ZnO nanorods with gold Au nanoparticles were synthesized on glass substrates using ultrasonic spray pyrolisis and hydrothermal methods and it was applied as a photocatalyst to degrade the methylene blue. The Au nanoparticles were deposited with hydrothermal method with variation of deposition temperatures of 90, 100, 110 and 120 C.

The characterization results using Ultraviolet Visible Spectroscopy, Diffuse Reflectance Spectroscopy, Photoluminescene PL , X Ray Diffraction, Transmission Electron Microscopy TEM , and Field Emission Scanning Electron Microscopy FESEM show that Au nanoparticles grow with diameter of 5 15 nm, polycrystalline with cubic crystal structure. The most optimum Au nanoparticles are grown at 110 C because they can iimprove the photocatalytic activity. Au nanoparticles act as the electron sinks that can inhibit the recombination of electrons and holes so more free charges were produced for photocatalyst reactions."