Thin-layer ultraviolet–visible reflectance spectroelectrochemistry with a spinning-grating monochromator

1990 ◽  
Vol 68 (12) ◽  
pp. 2234-2238 ◽  
Author(s):  
David H. Jones ◽  
A. Scott Hinman
Keyword(s):  
Time Delay ◽  
Thin Layer ◽  
Noise Level ◽  
Point Spectrum ◽  
Spectral Bandwidth ◽  
Grating Monochromator ◽  
Uv Visible ◽  
Scanning Spectroscopy ◽  
Visible Reflectance ◽  
Rapid Scanning

A thin-layer UV–visible spectroelectrochemistry system has been constructed using a commercially available spinning-grating monochromator. The spectroelectrochemical experiment is capable of scanning a wavelength range of 369 to 617 nm in 2.1 ms. The time delay between successive scans is 83 ms. The maximum peak-to-peak noise level in a 300-point spectrum collected during 2.1 ms with a spectral bandwidth of 2 nm is 0.03 absorbance units. The anodic spectroelectrochemistry of tetraphenylporphinatocopper(II), studied using the system, is presented. Keywords: thin-layer spectroelectrochemistry, rapid-scanning spectroscopy, spinning-grating monochromator, tetraphenylporphinatocopper(II).

Investigation of Some Characterizations of Black TiO\(_2\) Nanotubes Via Spectroscopic Methods

2019 ◽  
Vol 29 (2) ◽  
pp. 189 ◽  
Author(s):  
Tho Truong Nguyen ◽  
Thi Minh Cao ◽  
Hieu Van Le ◽  
Viet Van Pham
Keyword(s):  
Water Splitting ◽  
Oxygen Vacancies ◽  
Light Response ◽  
Nanotube Arrays ◽  
Spectroscopic Methods ◽  
Visible Light Response ◽  
Uv Visible ◽  
Visible Reflectance ◽  
Splitting Effect ◽  
Anodization Method

The black TiO\(_2\) with substantial Ti\(^3+\) and oxygen vacancies exhibit an excellent photoelectrochemical water-splitting performance due to the improved charge transport the extended visible light response. In this study, black TiO\(_2\) nanotube arrays synthesized by the anodization method, and then, they have been investigated some characterizations by spectroscopic methods such as UV-visible reflectance (UV-vis DRS), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and photoluminescence spectrum. The results showed that some highlighted properties of the black TiO2 nanotube arrays and they could apply for water-splitting effect.

The effects of preen oils and soiling on the UV–visible reflectance of carotenoid-pigmented feathers

2011 ◽  
Vol 65 (7) ◽  
pp. 1425-1435 ◽  
Author(s):  
Lorenzo Pérez-Rodríguez ◽  
Francois Mougeot ◽  
Gary R. Bortolotti
Keyword(s):  
Uv Visible ◽  
Visible Reflectance

scholarly journals Frequency-agile, rapid scanning spectroscopy

2013 ◽  
Vol 7 (7) ◽  
pp. 532-534 ◽  
Author(s):  
G.-W. Truong ◽  
K. O. Douglass ◽  
S. E. Maxwell ◽  
R. D. van Zee ◽  
D. F. Plusquellic ◽  
...  
Keyword(s):  
Frequency Agile ◽  
Scanning Spectroscopy ◽  
Rapid Scanning

Synthesis and Optical Properties of Sb-Doped CdS Photocatalysts and Their Use in Methylene Blue (MB) Degradation

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
Irem Firtina Ertis ◽  
Ismail Boz
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Irradiation Time ◽  
Chemical Precipitation ◽  
Hexagonal Structure ◽  
Mercury Lamp ◽  
Uv Visible ◽  
Cubic Structure ◽  
Visible Reflectance

Abstract Sb-CdS catalysts with good crystalline structure were prepared by chemical precipitation and hydrothermal method. The results showed that hydrothermal treatment is an effective method to prepare CdS based catalysts of hexagonal structure. Single Sb2S3 catalyst has spherical and Sb doped CdS catalysts have hexagonal structure. Sb doped CdS which is prepared by Na2S with chemical precipitation, has cubic structure. The band gap energies of Sb doped CdS photocatalysts were estimated using UV-visible reflectance spectra to be about the range of 2.35–2.57 eV. In particular, the photoluminescence (PL) spectra show enhancing emission peaks that strongly decrease with a doping Sb where the catalyst was prepared with ethylenediamine (EDA) and thioacetamide (TAA), has shown the lowest luminescence intensity. Photocatalytic degradation of methylene blue was carried out using Sb doped and Sb2S3-CdS binary catalysts under a 400 W medium-pressure mercury lamp of visible light irradiation (λ>420 nm). Higher photocatalytic degradation was achieved by adding Sb to CdS catalyst with using hydrothermal method and EDA as coordinating agent compare with the other catalysts. In this case the photocatalytic degradation of the Sb-CdS-EDA-TAA photocatalyst after 4 h irradiation time was about 84 %.

UV–visible reflectance spectra of nanocrystalline silver compacted under different pressures

2005 ◽  
Vol 341 (1-4) ◽  
pp. 216-220 ◽  
Author(s):  
Yanwu Lu ◽  
Hongfei Zhang ◽  
Fangxin Liu
Keyword(s):  
Reflectance Spectra ◽  
Uv Visible ◽  
Visible Reflectance
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