Sensitivity of Nanocrystalline Copper Sulfide/Cadmium Sulfide Heterojunction in Near-Ir Region

1995 ◽  
Vol 417 ◽  
Author(s):  
M. V. Artemyev ◽  
D. V. Sviridov ◽  
N. P. Gaponik ◽  
A. M. Maljarevich
Keyword(s):  
Cadmium Sulfide ◽  
Copper Sulfide ◽  
Copper Ions ◽  
Photovoltaic Effect ◽  
Electron Hole ◽  
Additional Absorption ◽  
Near Ir ◽  
Intervalence Charge Transfer ◽  
Additional Absorption Band ◽  
Sulfide Nanocrystals

AbstractThe photovoltaic p-n heterojunction based on thin layer of 10 nim size copper sulfide nanocrystals and evaporated cadmium sulfide film was prepared. The partial oxidation of copper sulfide nanocrystals prior the fabrication of the heterostructure results in the formation of additional absorption band in near-IR region beyond the fundamental absorption of bulk copper sulfide and cadmium sulfide. This band can be attributed to the intervalence charge transfer between copper ions in the core and in the oxidized shell. The photovoltaic effect observed in the near-IR region at ITO/nano-CuS/CdS/Au heterojunction is due to the generation of the electron-hole pairs in the CuS nanocrystalline film followed by the separation of charge carriers at the CuS/CdS junction.

Plasmonic Copper Sulfide Nanocrystals Exhibiting Near-Infrared Photothermal and Photodynamic Therapeutic Effects

ACS Nano ◽  
2015 ◽  
Vol 9 (2) ◽  
pp. 1788-1800 ◽  
Author(s):  
Shunhao Wang ◽  
Andreas Riedinger ◽  
Hongbo Li ◽  
Changhui Fu ◽  
Huiyu Liu ◽  
...  
Keyword(s):  
Copper Sulfide ◽  
Near Infrared ◽  
Therapeutic Effects ◽  
Sulfide Nanocrystals

Composition, stabilization, and light absorption of Fe(II)Fe(III) hydroxy-carbonate (‘green rust’)

Clay Minerals ◽  
1989 ◽  
Vol 24 (4) ◽  
pp. 663-669 ◽  
Author(s):  
H. C. B. Hansen
Keyword(s):  
Chloride Solution ◽  
Green Rust ◽  
Initial Reaction ◽  
Hydroxyl Groups ◽  
Natural Environments ◽  
Absorbance Maximum ◽  
Near Ir ◽  
Degree Of Oxidation ◽  
Intervalence Charge Transfer ◽  
Hydroxy Carbonate

AbstractThe chemical composition of the pyroaurite-type compound Fe(II)Fe(III) hydroxy-carbonate (‘green rust’) synthesised from freshly precipitated ferrihydrite and Fe(II) chloride solution at pH 7.0 (‘induced hydrolysis’) was determined. The compound was nearly stoichiometric, with the formula the Fe(II):Fe(III) ratio being independent of the Fe(II):Fe(III) ratio in the initial reaction mixture. It shows all the XRD peaks reported for this compound. Visible-near IR shows a broad peak at 650 nm which is ascribable to intervalence charge transfer and therefore the absorbance maximum decreases with increasing degree of oxidation. Wetting the material with compounds containing hydroxyl groups (such as glycerol or glucose) retards the oxidation of the otherwise very oxidation-sensitive compound. Similar polar organic compounds may stabilize the Fe(II)Fe(III) hydroxy-carbonate in wet soils. The importance of the green rust phase as an intermediate in the formation and transformation reactions of oxides and oxyhydroxides of iron in natural environments should not be ignored.

scholarly journals Water-Dispersible Copper Sulfide Nanocrystals via Ligand Exchange of 1-Dodecanethiol

2018 ◽  
Vol 31 (2) ◽  
pp. 541-552 ◽  
Author(s):  
Christina H. M. van Oversteeg ◽  
Freddy E. Oropeza ◽  
Jan P. Hofmann ◽  
Emiel J. M. Hensen ◽  
Petra E. de Jongh ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Copper Sulfide ◽  
Water Dispersible ◽  
Sulfide Nanocrystals

scholarly journals Development of copper sulfide/cadmium sulfide thin film solar cells

1980 ◽  
Author(s):  
J. Szedon ◽  
F. Shirland ◽  
J. Stoll ◽  
H. Dickey
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Cadmium Sulfide ◽  
Copper Sulfide ◽  
Thin Film Solar Cells

scholarly journals Preparation, Characterization and Swelling Studies of Carboxymethyl Sago Starch Hydrogel

2019 ◽  
Author(s):  
Normastura Sulta ◽  
Norhazlin Zainuddin ◽  
Mansor Bin Ahmad ◽  
Mas Jaffri Masarudin
Keyword(s):  
Reaction Time ◽  
Absorption Band ◽  
Acid Solution ◽  
Sago Starch ◽  
Additional Absorption ◽  
Sem Image ◽  
Swelling Degree ◽  
Swelling Studies ◽  
Ft Ir ◽  
Additional Absorption Band

Abstract Carboxymethyl sago starch (CMSS) hydrogel was prepared by dissolving CMSS in HCl solution under vigorous stirring to form gel. The parameter studied were the effect of the percentage of CMSS, concentration of the acid solution, reaction time and reaction temperature to identify the optimum condition of preparation of CMSS hydrogel. 60% of CMSS in 2.0M acid solution for 12 hours reaction time at room temperature were the optimum conditions for CMSS hydrogel. The hydrogel was characterized by using Fourier Transform Infrared (FT-IR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). FTIR spectrum of CMSS shows an additional absorption band at 1597 cm-1 indicating the substitution of CH2COO-Na+ group on the starch molecular chain during carboxymethylation, while the spectrum of CMSS hydrogel shows an additional sharp absorption band at 1723 cm-1 indicating that the Na in CMSS being exchanged to H from hydrochloric acid solution. SEM image of CMSS hydrogel shows pores in structure and connected to each other to form networks. TGA curve shows that the maximum rate of thermal decomposition of CMSS hydrogel is higher than CMSS at 330.22 ºC with 60.22% major weight loss. This could be due to the presence of the cross-linkages in the CMSS hydrogel. CMSS hydrogel gives high swelling degree in PBS solution at pH 7 and low swelling degree in acidic medium.

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