Determination of inhomogeneous character of optical transitions in CdSSe semiconductor nanocrystals at band edge at 300 K

1996 ◽  
Vol 131 (4-6) ◽  
pp. 327-332
Author(s):  
Fred Moshary ◽  
S.R. Hartmann
Keyword(s):  
Semiconductor Nanocrystals ◽  
Band Edge ◽  
Optical Transitions ◽  
Inhomogeneous Character

Determination of Concentration of Amphiphilic Polymer Molecules on the Surface of Encapsulated Semiconductor Nanocrystals

Langmuir ◽  
2016 ◽  
Vol 32 (8) ◽  
pp. 1955-1961 ◽  
Author(s):  
Aleksandra Fedosyuk ◽  
Aliaksandra Radchanka ◽  
Artsiom Antanovich ◽  
Anatol Prudnikau ◽  
Maksim V. Kvach ◽  
...  
Keyword(s):  
Semiconductor Nanocrystals ◽  
Amphiphilic Polymer ◽  
Polymer Molecules

scholarly journals Determination of the valence band edge of Fe oxide nanoparticles dispersed in aqueous solution through resonant photoelectron spectroscopy from a liquid microjet

2021 ◽  
Author(s):  
Giorgia Olivieri ◽  
Gregor Kladnik ◽  
Dean Cvetko ◽  
Matthew A. Brown
Keyword(s):  
Aqueous Solution ◽  
Electronic Structure ◽  
Valence Band ◽  
Photoelectron Spectroscopy ◽  
Band Edge ◽  
Photoemission Spectroscopy ◽  
Oxide Nanoparticles ◽  
Valence Band Edge ◽  
Resonant Photoemission

The electronic structure of hydrated nanoparticles can be unveiled by coupling a liquid microjet with a resonant photoemission spectroscopy.

Size-Dependent Valence and Conduction Band-Edge Energies of Semiconductor Nanocrystals

ACS Nano ◽  
2011 ◽  
Vol 5 (7) ◽  
pp. 5888-5902 ◽  
Author(s):  
Jacek Jasieniak ◽  
Marco Califano ◽  
Scott E. Watkins
Keyword(s):  
Conduction Band ◽  
Semiconductor Nanocrystals ◽  
Band Edge ◽  
Conduction Band Edge ◽  
Size Dependent

Biological Conjugate between Antibody and ZnS Nanoparticles as Probe for Atomic Absorption Spectrophotometry Determination of Estriol

2014 ◽  
Vol 556-562 ◽  
pp. 64-66
Author(s):  
Chun Yan Zhang ◽  
Chuan Tao Wang ◽  
Shu Hao Wang ◽  
Ling Yun Du
Keyword(s):  
Atomic Absorption ◽  
Limit Of Detection ◽  
Water Solution ◽  
Semiconductor Nanocrystals ◽  
Atomic Absorption Spectrophotometry ◽  
Serum Samples ◽  
Absorption Spectrophotometry ◽  
Primary Materials ◽  
Good Agreement

ZnS semiconductor nanocrystals (NCs) were prepared by ways from primary materials of ZnCl2 and Na2S in water solution. Using the synthesized ZnS NCs, a polyclonal antibody-based ZnS-labelled immunosorbent assay for the determination of estriol (E3) was developed with atomic absorption spectrophotometry (AAS) as a detector. An immunoaffinity column was applied to testify conjugation between antibody and ZnS NCs. The linear range for determination of estriol is 40.0~600.0 ng.mL-1, and the limit of detection (LOD) is 10.0 ng.mL-1. Some serum samples have been analyzed with satisfactory results which are in good agreement with those obtained using ELISA. This work suggests the potential application of NCs as biological probes and AAS as detector in nonisotopic immunoassay.

Calculation of Optical Characteristics for Si1-xGExAlloy

1995 ◽  
Vol 379 ◽  
Author(s):  
V. G. Litovchenkoe ◽  
S. I. Frolov ◽  
B. N. Shkarban ◽  
D. Kruger
Keyword(s):  
Crystal Lattice ◽  
Mechanical Stress ◽  
Measurement Technique ◽  
Lattice Strain ◽  
Uniaxial Stress ◽  
Material Composition ◽  
Optical Transitions ◽  
Virtual Crystal Approximation ◽  
Pseudopotential Theory

ABSTRACTIn the framework of virtual crystal approximation using the empirical pseudopotential theory optical transitions of Si1 -xGexhave been calculated. The effects of hydrostatic and uniaxial stress, and alloy stoichiometry on the optical gaps were investigated. Since the mechanical stress and material composition affect the distinctive behaviour of different optical transitions it allows to put forward a spectral measurement technique for determination of crystal lattice strain and alloy parameter x simultaneously.

scholarly journals (Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO2-Based Nanomaterials

2011 ◽  
Vol 2011 ◽  
pp. 1-20 ◽  
Author(s):  
Radim Beranek
Keyword(s):  
Thin Films ◽  
Nanostructured Materials ◽  
Heterogeneous Photocatalysis ◽  
Band Edge ◽  
Nanocrystalline Powders ◽  
Important Prerequisite ◽  
Solution Interface ◽  
Photochemical Systems ◽  
Nanocrystalline Thin Films

TiO2-based nanomaterials play currently a major role in the development of novel photochemical systems and devices. One of the key parameters determining the photoactivity of TiO2-based materials is the position of the band edges. Although its knowledge is an important prerequisite for understanding and optimizing the performance of photochemical systems, it has been often rather neglected in recent research, particularly in the field of heterogeneous photocatalysis. This paper provides a concise account of main methods for the determination of the position of the band edges, particularly those suitable for measurements on nanostructured materials. In the first part, a survey of key photophysical and photochemical concepts necessary for understanding the energetics at the semiconductor/solution interface is provided. This is followed by a detailed discussion of several electrochemical, photoelectrochemical, and spectroelectrochemical methods that can be applied for the determination of band edge positions in compact and nanocrystalline thin films, as well as in nanocrystalline powders.

The Interpretation of the Constant Photocurrent Method in Terms of Deep Defect Density of States in A-SI.H

1994 ◽  
Vol 336 ◽  
Author(s):  
Frank Siebke ◽  
Helmut Stiebig
Keyword(s):  
Electron Spin Resonance ◽  
Photoelectron Spectroscopy ◽  
Defect Density ◽  
Total Yield ◽  
Calibration Factor ◽  
Optical Transitions ◽  
Absolute Value ◽  
Spin Resonance ◽  
Pool Model

ABSTRACTThe constant photocurrent Method (CPM) is often used to measure the sub-bandgap absorption for the determination of the defect density. However, the absolute value of the derived defect density depends on the method of data analysis and the calibration factor. Normally the calibration factor is obtained from electron spin resonance (ESR) but the defect pool model gives rise to doubt whether ESR detects the same defects as CPm. Therefore, we propose combined total-yield photoelectron spectroscopy (TYPES) and CPM Measurements on n-type a-Si:H to determine the calibration factor. Furthermore, we calculate CPM spectra by extending an approach to simulate photoconductivity, taking into account the full set of optical transitions, and compare the results with standard evaluation Methods.

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