Synthesis and light absorption properties of copper sulfide nanowire arrays on different substrates

2018 ◽  
Vol 550 ◽  
pp. 26-31 ◽  
Author(s):  
Liqiang Li ◽  
Wenxing Zhang
Keyword(s):  
Light Absorption ◽  
Copper Sulfide ◽  
Nanowire Arrays ◽  
Absorption Properties

scholarly journals Light-induced levitation of ultralight carbon aerogels via temperature control

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Reo Yanagi ◽  
Ren Takemoto ◽  
Kenta Ono ◽  
Tomonaga Ueno
Keyword(s):  
Carbon Nanotubes ◽  
Heat Capacity ◽  
Porous Materials ◽  
Temperature Control ◽  
Light Absorption ◽  
Carbon Aerogel ◽  
Carbon Aerogels ◽  
Halogen Lamp ◽  
Absorption Properties ◽  
Air Density

AbstractWe demonstrate that ultralight carbon aerogels with skeletal densities lesser than the air density can levitate in air, based on Archimedes' principle, when heated with light. Porous materials, such as aerogels, facilitate the fabrication of materials with density less than that of air. However, their apparent density increases because of the air inside the materials, and therefore, they cannot levitate in air under normal conditions. Ultralight carbon aerogels, fabricated using carbon nanotubes, have excellent light absorption properties and can be quickly heated by a lamp owing to their small heat capacity. In this study, an ultralight carbon aerogel was heated with a halogen lamp and levitated in air by expanding the air inside as well as selectively reducing its density. We also show that the levitation of the ultralight carbon aerogel can be easily controlled by turning the lamp on and off. These findings are expected to be useful for various applications of aerogels, such as in communication and transportation through the sky.

Tuning visible-light absorption properties of Ru–diacetylide complexes: simple access to colorful efficient dyes for DSSCs

2015 ◽  
Vol 3 (35) ◽  
pp. 18256-18264 ◽  
Author(s):  
Samuel De Sousa ◽  
Siliu Lyu ◽  
Laurent Ducasse ◽  
Thierry Toupance ◽  
Céline Olivier
Keyword(s):  
Solar Cell ◽  
Visible Light ◽  
Light Absorption ◽  
Dye Sensitized Solar Cell ◽  
Absorption Properties ◽  
Visible Light Absorption ◽  
Color Palette ◽  
Dye Sensitized

An attractive color palette of red, violet and blue-green chromophores was prepared for dye-sensitized solar cell applications. The chromophores are used in single-dye and co-sensitized devices.

The Light Absorption Properties of Cu2S Nanowire Arrays

2012 ◽  
Vol 528 ◽  
pp. 272-276 ◽  
Author(s):  
Shan Ren ◽  
Li Qiang Li ◽  
Zhu Feng Liu ◽  
Ming Li ◽  
Lan Hong
Keyword(s):  
Optical Properties ◽  
Distribution Density ◽  
Photovoltaic Cell ◽  
Nanowire Arrays ◽  
Band Gaps ◽  
Infrared Light ◽  
Infrared Band ◽  
Absorption Properties ◽  
Potential Applications ◽  
Cu Foil

Cu2S nanowire arrays with different morphologies were prepared by solid-gas reaction between Cu foil and mixture gas of H2S and O2. Their microstructures were observed with XRD, TEM, and the optical properties were measured by DRS, PL and Raman. The results showed that the nanowire were Cu2S single crystal with a thin layer CuxO (x=1, 2) over the surface. The optical properties of the Cu2S nanowire arrays are related to the diameter, length, and distribution density of nanowire arrays. The thinner is the nanowire’s diameter; the bigger is the absorption of the visible light, and the absorbance begun to descend within infrared band. The absorbance of nanowire arrays with bigger diameter to the infrared light was stronger than that with thinner diameter. The photoluminescence spectrum (PL) indicated that band gaps of Cu2S nanowire arrays also changed simultaneously with the nanowire arrays’ structure parameters. The research demonstrated the Cu2S nanowire arrays’ potential applications in the photovoltaic cell and solar-heat harvesting area.

scholarly journals A dominant contribution to light absorption by methanol-insoluble brown carbon produced in the combustion of biomass fuels typically consumed in wildland fires in the United States

2022 ◽  
Author(s):  
Khairallah Atwi ◽  
Charles Perrie ◽  
Zezhen Cheng ◽  
Omar El Hajj ◽  
Rawad Saleh
Keyword(s):  
United States ◽  
Solvent Extraction ◽  
Light Absorption ◽  
The United States ◽  
Extraction Methods ◽  
Wildland Fires ◽  
Dominant Contribution ◽  
Biomass Fuels ◽  
Absorption Properties ◽  
Brown Carbon

The light-absorption properties of brown carbon (BrC) are often estimated using offline, solvent-extraction methods. However, recent studies have found evidence of insoluble species of BrC which are unaccounted for in...

scholarly journals Light absorption by polar and non-polar aerosol compounds from laboratory biomass combustion

2018 ◽  
Author(s):  
Deep Sengupta ◽  
Vera Samburova ◽  
Chiranjivi Bhattarai ◽  
Elena Kirillova ◽  
Lynn Mazzoleni ◽  
...  
Keyword(s):  
Light Absorption ◽  
Flow Reactor ◽  
Soluble Fraction ◽  
Chemical Properties ◽  
Water Soluble ◽  
Biomass Combustion ◽  
Absorption Properties ◽  
Oxidation Processes ◽  
Aerosol Mass ◽  
Physical Processing

Abstract. Fresh and atmospherically aged biomass-burning (BB) aerosol mass is mostly comprised of black carbon (BC) and organic carbon (OC) with its light-absorbing fraction – brown carbon (BrC). There is a lack of data on the physical and chemical properties of atmospheric BB aerosols, leading to high uncertainties in estimates of the BB impact on air quality and climate, especially for BrC. The polarity of chemical compounds influences their fate in the atmosphere including wet/dry deposition and chemical and physical processing. So far, most of the attention has been given to the water-soluble (polar) fraction of BrC, while the non-polar BrC fraction has been largely ignored. In the present study, the light absorption properties of polar and non-polar fractions of fresh and aged BB emissions were examined to estimate the contribution of different-polarity organic compounds to the light absorption properties of BB aerosols. In our experiments, four globally and regionally important fuels were burned under flaming and smoldering conditions in DRI’s combustion chamber. To mimic atmospheric oxidation processes (5–7 days), BB emissions were aged using an oxidation flow reactor (OFR). Fresh and OFR-aged BB aerosols were collected on filters and extracted with water and hexane to study absorption properties of polar and non-polar organic species. Spectrophotometric measurements over the 190 to 900 nm wavelength range showed that the non-polar (hexane-soluble) fraction is 2–3 times more absorbing than the polar (water-soluble) fraction. However, an increased absorbance was observed for the water extracts of oxidized/aged emissions while the absorption of the hexane extracts was lower for the aged emissions. Comparing the absorption Ångström Exponent (AAE) values, we observed changes in the light absorption properties of BB aerosols with aging that was dependent on the fuel types. The light absorption by HUmic LIke Substances (HULIS) was found to be higher in fuels characteristic of the southwestern USA. The absorption of the HULIS fraction was lower for OFR-aged BB emissions. Comparison of the light absorption properties of different polarity extracts (water, hexane, HULIS) provides insight into the chemical nature of BB BrC and its transformation during oxidation processes.

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