scholarly journals Study on the effect of Ag nanoparticles density on ZnO/Ag nanostructure to enhance raman signals of SERS substrate on abamectin

2021 ◽  
Vol 5 (2) ◽  
pp. first
Author(s):  
Long Hoang Nguyen ◽  
Thanh Ha Nguyen ◽  
Tuan Anh Dao ◽  
Ke Huu Nguyen ◽  
Hung Vu Tuan Le
Keyword(s):  
Ag Nanoparticles ◽  
Chemical Elements ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Excitation Wavelength ◽  
Diffraction Measurement ◽  
Sers Substrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sers Substrates

This study investigated the effect of changing the density of Ag nanoparticles on the ZnO/Ag nanorod structure on the SERS substrate signal amplification ability. First, ZnO nanorods were fabricated by the sol - gel method combining with the chemical bath deposition method. Next, the Ag nanoparticles were decorated on ZnO nanorods by the DC magnetron sputtering method. The density and size of the modified Ag nanoparticles on the ZnO nanorods were changed by adjusting the sputtering times to 5, 10, 15 and 20s respectively. The optical properties of the material are characterized by UV - Vis and PL measurements. The surface morphology of ZnO nanorods and Ag nanoparticles were investigated by scanning electron microscope (SEM). X-ray diffraction measurement (XRD) is used to examine the crystal structures of materials. The composition and distribution of the chemical elements inside the material were investigated by Energy-dispersive X-ray spectroscopy (EDX). The ability of SERS substrates to amplify Raman signals was evaluated by measuring the R6G solution and investigating application for abamectin with a laser excitation wavelength of 532 nm. The results showed that SERS ZnO/Ag substrates with sputtering time of 15s gave the best ability to amplify SERS with the detection of R6G solution at 10􀀀9 M and abamectin at 50 ppm.

The Effect of Stabiliser’s Molarity to the Growth of ZnO Nanorods

2011 ◽  
Vol 312-315 ◽  
pp. 99-103 ◽  
Author(s):  
Zuraida Khusaimi ◽  
Mohamad Hafiz Mamat ◽  
Mohd Zainizan Sahdan ◽  
Norbani Abdullah ◽  
Mohamad Rusop
Keyword(s):  
Sol Gel ◽  
Zno Nanorods ◽  
Structural Features ◽  
Zinc Nitrate ◽  
Molar Ratio ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wet Chemical ◽  
Gel Preparation

A wet chemical approach, originating from sol-gel preparation, was adopted with the intention to develop a low-temperature benign method of preparation. ZnO nanorods are successfully grown in an aqueous medium. The precursor, zinc nitrate hexahydrate (Zn(NO3)2.6H2O), is stabilized by hexamethylene tetraamine (HMTA). The effect of changing the molarity of HMTA to the structural orientation of ZnO nanorods is investigated. X-ray diffraction of the synthesized ZnO shows hexagonal zincite structure. The structural features of the nanocrystalline ZnO were studied by SEM. Structural features, surface morphology and differences in lattice orientation are seemingly influenced by varying the Zn2+: HMTA molar ratio. The formation of ZnO nanorods with blunt and sharp tips is found to be significantly affected by this ratio.

Structural and Photoluminescence Characteristics of ZnTiO3:Pb2+ Nanofibers Produced by Electrospinning

2013 ◽  
Vol 562-565 ◽  
pp. 908-913 ◽  
Author(s):  
Rong Li Sang ◽  
Ying Chen ◽  
Qing Jun Zhang ◽  
Lin Wang
Keyword(s):  
Sol Gel ◽  
Excitation Wavelength ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
X Ray ◽  
Charge Transfer Transitions ◽  
Ultrathin Fibers ◽  
Ft Ir ◽  
Gel Processing ◽  
Scanning Electron

By sol-gel processing and electrospinning technique, ultrathin fibers of PVP/ ZnTiO3:Pb2+ composites were synthesized. After calcined of the fibers at 600°C, the spinel ZnTiO3:Pb2+ nanofibers, with a diameter of 100-200nm, were successfully obtained. The scanning electron microscopy (SEM), fourier transform infrared (FT-IR), X-ray diffraction (XRD) and photoluminescence (PL) were employed in the study. The results displayed that the morphology and crystalline phase of the fibers were greatly affecteded by the calcination temperature. The PL spectra of the samples measured at different excitation wavelength reveal a novel luminescent phenomenon in blue and green region, which can be attributed to the Pb2+-related charge-transfer transitions in ZnTiO3 nanofibers.

Nanocrystalline SnO2 Particles and Twofold-coordinated Sn Defect Centers in Sol-gel-derived SnO2–SiO2 Glasses

2002 ◽  
Vol 17 (6) ◽  
pp. 1305-1311 ◽  
Author(s):  
Tomokatsu Hayakawa ◽  
Takehiro Enomoto ◽  
Masayuki Nogami
Keyword(s):  
Quantum Confinement ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Stannic Oxide ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Absorption Edge Shift ◽  
Electron Hole Pair

Semiconductive nanocrystals of stannic oxide (SnO2) were precipitated in silica (SiO2) glasses synthesized via a sol-gel route. Kayanuma's equation, which describes the quantum confinement of an electron–hole pair in a semiconductive particle, well explained the absorption-edge shift due to the SnO2 nanocrystals in the optical absorption spectra. The adequate anneal of the SnO2–SiO2 glass ceramics in H2 gas led to the decomposition of the SnO2 nanocrystals and concurrently the production of twofold-coordinated tin atoms (Sn20 ) that provided a violet photoluminescence. The thermal behavior was studied with the x-ray diffraction measurement and photoluminescence and photoluminescence excitation spectroscopy.

Fabrication of ZnO Nanorods on Silicon Substrates by Sol-gel Hyrdothermal Methods

2015 ◽  
Vol 18 (2) ◽  
pp. 083-086
Author(s):  
Yow-Chyun Shyu ◽  
Min Han Lin ◽  
Shang-Ren Lin ◽  
Shang Lin Tsai ◽  
Chin Pang Chen ◽  
...  
Keyword(s):  
Seed Layer ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Silicon Substrates ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Growth Orientation ◽  
Multiple Material ◽  
Hydrothermal Methods

ZnO nanorods were deposited on silicon substrate using sol-gel hydrothermal methods. The seed layer was first grown by sol-gel methods and then annealed at temperatures of 300ºC, 400ºC, 500ºC and 600ºC. Multiple material and optical analyses including field-emission scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray diffraction, photoluminescence spectra, and Raman spectra were conducted to examine the growth orientation and material properties. Results indicate that the ZnO nanorods annealed at a proper temperature of 400ºC could enhance orientation and material quality.

scholarly journals Development of self-cleaning SERS-active nanostructures based on ZnO nanorods and Ag nanoparticles

2021 ◽  
Vol 2103 (1) ◽  
pp. 012128
Author(s):  
D V Novikov ◽  
N S Malakhov ◽  
A M Tarasov ◽  
A I Savitskiy ◽  
S V Dubkov ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Radiation Treatment ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Sers Substrate ◽  
Sers Substrates ◽  
Oxide Nanorods ◽  
Spectral Peaks ◽  
Mathematical Processing ◽  
Self Cleaning

Abstract This work demonstrates the possibility of using a combination of zinc oxide nanorods with silver nanoparticles as a self-cleaning SERS substrate. In addition to Raman scattering enhancement such structures demonstrate the self-cleaning effect during UV treatment. The ZnO nanorods (NRs) array was synthesized on a ZnO seed layer by the hydrothermal method. The Ag nanoparticles (NPs) array was formed by vacuum thermal evaporation over the ZnO NRs. Rhodamine-B 230 μM solution has been detected using the formed SERS-substrates without additional mathematical processing of the Raman spectra. Subsequent UV radiation treatment showed a 3-fold decrease in the intensity of the spectral peaks of the analyte.

scholarly journals Synthesis Of Zincoxide Nanorods And Its Application To Humidity Sensor

2015 ◽  
Vol 20 (1) ◽  
pp. 36-39 ◽  
Author(s):  
Indra Bahadur Karki ◽  
Jeevan Jyoti Nakarmi ◽  
Suman Chatterjee
Keyword(s):  
Thin Films ◽  
Glass Substrate ◽  
Humidity Sensor ◽  
Sol Gel ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
Humidity Sensors ◽  
X Ray ◽  
Sem Image ◽  
Humid Environment

The present study is concerned the sensing behavior of ZnO nanorods thin films application to humidity sensors. ZnO nanorods were fabricated on a glass substrate by sol-gel spin coating technique. The crystal structure of the resulting thin films was investigated by X-ray diffraction (XRD). Minimum crystalline grain size of this film was found about 5nm. Surface morphology of the film was investigated by Scanning Electron Microscope (SEM). SEM image shows rods like films which are evenly distributed on the surface of the sample. The film on a glass substrate explored for humidity sensing of controlled humid environment by measuring electrical resistance. The resistance falls from M Ohms to K ohms as percentage relative humidity increases from 20 to 90 %.Journal of Institute of Science and Technology, 2015, 20(1): 36-39

Effect of Detergent on the ZnO Nanorods Structures Synthesized via the Sol-Gel Method

2012 ◽  
Vol 545 ◽  
pp. 161-164
Author(s):  
Rusdi Roshidah ◽  
Abd Rahman Azilah ◽  
Norlida Kamarulzaman
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Inorganic Material ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gap Energy ◽  
Thermogravimetric Analyzer

ZnO is known as an inorganic material that has a variety of morphologies. The morphologies of the ZnO are much influenced by the synthesis route. In this work, two ZnO nanomaterials were prepared by the sol-gel route and the effect of detergent on the morphology and optical band gap of ZnO materials were investigated. The synthesized ZnO materials were characterized using Simultaneous Thermogravimetric Analyzer (STA), X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM). The UV-Vis spectrophotometer is used to determine the optical band gap. The results show that the presence of detergent affected the morphology of the ZnO from nanorods to nano-flakes. The band gap energy of the ZnO were also reduced from 3.14 ev to 2.98 eV from the nanorod to the nanoflakes.

Synthesis and Characterization of Zn doped Li(Li0.21Mn0.54Ni0.125Co0.125)O2 as the Layer Materials For Battery Applications

2018 ◽  
Vol 21 (2) ◽  
pp. 127-131
Author(s):  
S. Rumh. Kadhim ◽  
Reihan Etefagh ◽  
H. Arabi
Keyword(s):  
Infrared Spectroscopy ◽  
Chemical Elements ◽  
Sol Gel ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Physical And Chemical ◽  
And Chemical Properties

In this paper, pure and impure nanopowders of Li(Li0.021Mn0.54Ni0.125Co0.125)O2 were prepared with different percentages (x=0.02%, 0.05%, 0.075%, 0.10%) of Zn impurity by sol-gel method, and the effect of different percentages were investigated on the structural, physical and chemical properties of the samples. These properties of samples characterized by X-ray diffraction (XRD), field-scattering microscopy (FESEM), X-ray energy spectroscopy (EDS), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA), infrared spectroscopy (FTIR), and the results of characterization were investigation. All the reflection peaks indicate that the samples have standard α-NaFeO2 layered structure with the space group R3m, except for the super lattice ordering between 22°-25°.The FESEM images have shown that these nanoparticles have Hexagonal structures for doped and undoped nanopowders. The particle size of nanopowders in the range of 30-80 nm the chemical analysis of EDS has proven the presence of Zn in the samples. TG /DTA measurements showed weight loss in pure and impure of nanopowders. In infrared spectroscopy (FTIR), the connection bonds and chemical elements used in these nanopowders have been investigated.

PENGGUNAAN TiO2 PARTIKEL NANO HASIL SINTESIS BERBASIS AIR MENGGUNAKAN METODA SOL-GEL PADA BAHAN KAPAS SEBAGAI APLIKASI UNTUK TEKSTIL ANTI UV

Arena Tekstil ◽  
2013 ◽  
Vol 28 (1) ◽  
Author(s):  
Maya Komalasari ◽  
Bambang Sunendar
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Sol Gel ◽  
Crosslinking Agent ◽  
X Ray Diffraction ◽  
Nano Tio2 ◽  
X Ray ◽  
Infra Red ◽  
Scanning Electron

Partikel nano TiO2 berbasis air dengan pH basa telah berhasil disintesis dengan menggunakan metode sol-gel dan diimobilisasi pada kain kapas dengan menggunakan kitosan sebagai zat pengikat silang. Sintesis dilakukan  dengan prekursor TiCl4 pada konsentrasi 0,3 M, 0,5 M dan 1 M, dan menggunakan templat kanji dengan proses kalsinasi pada suhu 500˚C selama 2 jam. Partikel nano TiO2 diaplikasikan ke kain kapas dengan metoda pad-dry-cure dan menggunakan kitosan sebagai crosslinking agent. Berdasarkan hasil Scanning Electron Microscope (SEM),diketahui bahwa morfologi partikel TiO2 berbentuk spherical dengan ukuran nano (kurang dari 100 nm). Karakterisasi X-Ray Diffraction (XRD) menunjukkan adanya tiga tipe struktur kristal utama, yaitu (100), (101) dan (102) dengan fasa kristal yang terbentuk adalah anatase dan rutile. Pada karakterisasi menggunakan SEM terhadap serbuk dari TiO2 yang telah diaplikasikan ke permukaan kain kapas, terlihat adanya imobilisasi partikel nano TiO2 melalui ikatan hidrogen silang dengan kitosan pada kain kapas. Hasil analisa tersebut kemudian dikonfirmasi dengan FTIR (Fourier Transform Infra Red) yang hasilnya memperlihatkan puncak serapan pada bilangan gelombang 3495 cm-1, 2546 cm-1, dan 511 cm-1,  yang masing-masing diasumsikan sebagai adanya vibrasi gugus fungsi O-H, N-H dan Ti-O-Ti. Hasil SEM menunjukkan pula bahwa kristal nano yang terbentuk diantaranya adalah fasa rutile , yang berdasarkan literatur terbukti dapatberfungsi sebagai anti UV.

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