Gold Nanoparticle Aggregates Preparation by (3-aminpopropyl)- Trimethoxysilane for Highly Active SERS Substrates

2012 ◽  
Vol 562-564 ◽  
pp. 94-97
Author(s):  
Min Zhou ◽  
Qiu Mei Ma ◽  
Yan Wei Wang ◽  
Guang Can Yang
Keyword(s):  
Gold Nanoparticle ◽  
Active Surface ◽  
Morphological Properties ◽  
Force Microscopy ◽  
Sers Substrates ◽  
Highly Active ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Surface Enhanced Raman ◽  
Nanoparticle Aggregates

A simple preparation method of gold nanoparticle aggregates for highly active surface enhanced Raman scattering (SERS) substrates is developed by adding APS to gold sol under vigorous magnetic stirring. The optical and morphological properties of these aggregates are examined by UV-vis spectroscopy and atomic force microscopy. It is found that the SERS activity of the new synthesized gold nanoparticle aggregates is about 200 higher than that of single gold nanoparticles with Rhodamine 6G(R6G) probe.

scholarly journals Unique Gold Nanoparticle Aggregates as a Highly Active Surface-Enhanced Raman Scattering Substrate

2004 ◽  
Vol 108 (50) ◽  
pp. 19191-19197 ◽  
Author(s):  
Adam M. Schwartzberg ◽  
Christian D. Grant ◽  
Abraham Wolcott ◽  
Chad E. Talley ◽  
Thomas R. Huser ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Gold Nanoparticle ◽  
Active Surface ◽  
Surface Enhanced Raman Scattering ◽  
Highly Active ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanoparticle Aggregates ◽  
Enhanced Raman Scattering

scholarly journals Fabrication of Self-Standing Silver Nanoplate Arrays by Seed-Decorated Electrochemical Route and Their Structure-Induced Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Guangqiang Liu ◽  
Guotao Duan ◽  
Lichao Jia ◽  
Jingjing Wang ◽  
Hongzhi Wang ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Electrochemical Capacitor ◽  
Active Surface ◽  
Sers Substrates ◽  
Highly Active ◽  
Ito Glass ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Very High

We present an electrochemical route to synthesize silver nanoplates on seed-decorated Indium tin oxide (ITO) glass substrate. The nanoplates are several tens of to several hundred nanometers in dimension. The density of nanoplates covered on the substrate can be controlled well by adjusting the amounts of seed. All the nanoplates are standing on the substrate uniformly even at very high density. Silver nanoplate arrays displayed an extraordinary superhydrophobicity after chemical modification and can serve as highly active surface-enhanced Raman scattering (SERS) substrates for microdetection. The arrays can also be used as electrodes for electrochemical capacitor with high power density.

Influence of RF Magnetron Sputtering Pressure on the Structural, Optical, and Morphological Properties of Indium Tin Oxide Nanocolumns

2013 ◽  
Vol 832 ◽  
pp. 276-280
Author(s):  
S. Najwa ◽  
A. Shuhaimi ◽  
N. Ameera ◽  
K.M. Hakim ◽  
M. Sobri ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Indium Tin Oxide ◽  
Rf Magnetron Sputtering ◽  
Optical Transmittance ◽  
Morphological Properties ◽  
Visible Range ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Sputtering Pressure

In the present study, ITO nanocolumn was successfully deposited onto a glass substrate by RF magnetron sputtering. The effect of deposition pressure was investigated. X-ray diffraction analysis indicates that the intensity of the (400) peak orientation is highest at sputtering pressure of 5 mTorr. The results from UV-visible (UV-vis) spectroscopy revealed that the optical transmittance above 80 % was obtained from the all samples in the visible range of 400-800 nm. The larger grain size was observed from the top view of field emission scanning electron microscopy (FESEM) image as the sputtering pressure was increase. Dense nanocolumn arrays were obtained from the sample deposited at sputtering pressure of 5 mTorr. The surface roughness were decreased at high sputtering pressure of 10 mTorr was observed from atomic force microscopy (AFM) surface morphology. The electrical properties were obtained using standard two-point probe measurements. The lowest electrical resistivity was determined from the sample that prepared at sputtering pressure of 5 mTorr.

Urchin-like Au-nanoparticles@Ag-nanohemisphere arrays as active SERS-substrates for recognition of PCBs

RSC Advances ◽  
2014 ◽  
Vol 4 (38) ◽  
pp. 19654-19657 ◽  
Author(s):  
Haibin Tang ◽  
Guowen Meng ◽  
Qing Huang ◽  
Chuhong Zhu ◽  
Zhulin Huang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Large Scale ◽  
Au Nanoparticles ◽  
Active Surface ◽  
Sers Substrates ◽  
Highly Active ◽  
Surface Enhanced ◽  
Nanodot Arrays ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Large-scale ordered urchin-like Au-nanoparticles decorated Ag-nanohemisphere nanodot arrays show highly active surface-enhanced Raman scattering effect for rapid recognition of PCB-3.

Nanocrystalline Solutions as Precursors to The Spray Deposition of Cdte Thin Films

1995 ◽  
Vol 382 ◽  
Author(s):  
Martin Pehnt ◽  
Douglas L. Schulz ◽  
Calvin J. Curtis ◽  
Helio R. Moutinho ◽  
Amy Swartzlander ◽  
...  
Keyword(s):  
Thin Films ◽  
Atomic Force Microscopy ◽  
Grain Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Cdte Nanoparticles ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Cdte Thin Films

ABSTRACTIn this article we report the first nanoparticle-derived route to smooth, dense, phase-pure CdTe thin films. Capped CdTe nanoparticles were prepared by injection of a mixture of Cd(CH3)2, (n-C8H17)3 PTe and (n-C8H17)3P into (n-C8H17)3PO at elevated temperatures. The resultant nanoparticles 32-45 Å in diameter were characterized by x-ray diffraction, UV-Vis spectroscopy, transmission electron microscopy, thermogravimetric analysis and energy dispersive x-ray spectroscopy. CdTe thin film deposition was accomplished by dissolving CdTe nanoparticles in butanol and then spraying the solution onto SnO2-coated glass substrates at variable susceptor temperatures. Smooth and dense CdTe thin films were obtained using growth temperatures approximately 200 °C less than conventional spray pyrolysis approaches. CdTe films were characterized by x-ray diffraction, UV-Vis spectroscopy, atomic force microscopy, and Auger electron spectroscopy. An increase in crystallinity and average grain size as determined by x-ray diffraction was noted as growth temperature was increased from 240 to 300 °C. This temperature dependence of film grain size was further confirmed by atomic force microscopy with no remnant nanocrystalline morphological features detected. UV-Vis characterization of the CdTe thin films revealed a gradual decrease of the band gap (i.e., elimination of nanocrystalline CdTe phase) as the growth temperature was increased with bulk CdTe optical properties observed for films grown at 300 °C.

scholarly journals SERS on Bimetallic Nanostructured thin films

2021 ◽  
Author(s):  
revathy m s ◽  
D Murugesan ◽  
Naidu Dhanpal Jayram
Keyword(s):  
Thin Films ◽  
Thermal Evaporation ◽  
Low Cost ◽  
Active Surface ◽  
Surface Enhanced Raman Spectroscopy ◽  
Nanostructured Film ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
The Cost

Abstract Thin films and Surface Enhanced Raman spectroscopy have a strong bonding towards development of Sensors. From last 4 decades SERS has been used as effective tool for detection of toxic dyes, in food industry and agriculture world. To minimize the cost and fabrication over large surface is the most challenging task in substrate fabrication. In the present work an attempt has been made towards dual coatings, which could act as an effective SERS Substrates. An effective and facile approach of low cost bi-metallic Nanostructured film has been fabricated using thermal evaporation. Using the standard characterization techniques such as FE-SEM and XRD, the obtained films were Rhodamine 6G was used as an analyte for the SERS studies. The detection of R6G was up to 10− 10mol l− 1solution.The present bi-metallic coating can be serves as an excellent SERS active surface and provides a versatile pathway to fabricate anisotropic nanostructure on a glass film.

scholarly journals Structural and Morphological Properties of Titanium Aluminum Nitride Coatings Produced by Triode Magnetron Sputtering

2014 ◽  
Vol 10 (20) ◽  
pp. 51-64 ◽  
Author(s):  
D.M. Devia ◽  
E. Restrepo-Parra ◽  
J.M. Velez-Restrepo
Keyword(s):  
Magnetron Sputtering ◽  
Bias Voltage ◽  
Structural Changes ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Titanium Aluminum ◽  
Microscopy Techniques ◽  
Titanium Aluminum Nitride

Tix Al1−xN coatings were grown using the triode magnetron sputtering technique varying the bias voltage between -40 V and -150V. The influence of bias voltage on structural and morphological properties was analyzed by means of energy dispersive spectroscopy, x-ray diffraction and atomic force microscopy techniques. As the bias voltage increased, an increase inthe Al atomic percentage was observed competing with Ti and producing structural changes. At low Al concentrations, the film presented a FCC crystalline structure; nevertheless, as Al was increased, the structure pre-sented a mix of FCC and HCP phases. On the other hand, an increase inbias voltage produced a decrease films thickness due to an increase in colli-sions. Moreover, the grain size and roughness were also strongly influencedby bias voltage.

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