scholarly journals Carbon Aerogel Based Waterborne Ultra-Black Coatings with High Light Absorption

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 563
Author(s):  
Jie Xu ◽  
Yifan Shi ◽  
Jiangling Li ◽  
Guangzhen Cui ◽  
Guangxin Gu
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Carbon Aerogel ◽  
Infrared Region ◽  
Carbon Aerogels ◽  
Formaldehyde Resin ◽  
Complex Processes ◽  
Light Region ◽  
Black Films ◽  
Binder Ratio

In this paper, we wish to report the preparation of ultra-black films via spraying coatings composed of waterborne binders and low-cost carbon aerogels on pre-treated tinplate. The CAs were prepared by annealing resorcinol-formaldehyde resin (RF resin) and the following CO2 activation, of which the reflectance was less than 0.4% in a wide wavelength range. The reflectance of different coatings, which using CAs as functional pigments, ranged from 1.8% to 4.3% in the visible light region (400−760 nm), while it ranged from 1.9% to 4.2% in the near-infrared region (760–1100 nm). Further studies revealed the relationship between the pigment-to-binder ratio and reflectance and found the best ratio to be 0.96, and the minimum reflection was less than 1.8%. Outstanding adhesion to the tinplate substrate was also achieved using a two-component polyurethane binder after the thermal cycling test carried out from −100 °C to 100 °C. The fabrication process of ultra-black coatings is particularly convenient to remove the constraints of high costs and complex processes, making it instructive guidance for industrial production.

Effect of Morphology on Near-Infrared Shielding Properties of Aluminum-Doped ZnO by Solvothermal Synthesis

2020 ◽  
Vol 1007 ◽  
pp. 148-153
Author(s):  
Pimpaka Putthithanas ◽  
Supan Yodyingyong ◽  
Jeerapond Leelawattanachai ◽  
Wannapong Triampo ◽  
Noppakun Sanpo ◽  
...  
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Hexagonal Wurtzite Structure ◽  
Infrared Region ◽  
X Ray Diffraction ◽  
Smart Window ◽  
Doped Zno ◽  
Heat Shielding ◽  
Xrd Patterns ◽  
Potential Use

In this work, aluminum-doped ZnO (AZO) is synthesized for heat-shielding applications. A family of ethanolamine (EA: monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine TEA)) is used to control the morphology of aluminum-doped ZnO (AZO) synthesized via a simple solvothermal method at the temperature of 120°C for 6 h. The samples were characterized by field-emission scanning electron microscopy (FE-SEM). The formation of primary ZnO nanoparticles (NPs) showed that TEA yielded highly packed-spherical aggregates not found when DEA and MEA were used. X-ray diffraction (XRD) found that all AZO samples have peaks of the ZnO hexagonal wurtzite structure. XRD patterns of aluminum were found for >10 mol%. UV-Vis-NIR spectrophotometer was used to study the optical property and heat-shielding of the near-infrared region (NIR, the wavelength from 700 - 2500 nm). All AZO NPs of 0, 2, 4, and 10 mol% exhibited strong NIR shielding ability up to 80% insulation. From these results, the AZO NPs have potential use as NIR shielding materials of low-cost and simple processes to be coated on an energy-efficient window as smart window coating in buildings and automotive thus reducing energy consumption, especially in air conditioning usage.

Transparency of modified vinyl-silsesquioxane films and its validation by computing energy-band structure

2010 ◽  
Vol 25 (1) ◽  
pp. 76-81 ◽  
Author(s):  
Xiao-Dong Chen ◽  
Di Wang ◽  
De-Rong Lin ◽  
Qun Zhang ◽  
Li-Jiang Hu
Keyword(s):  
Band Structure ◽  
Energy Band ◽  
Near Infrared ◽  
Building Blocks ◽  
Infrared Region ◽  
Hybrid Structure ◽  
Energy Band Structure ◽  
Process Efficiency ◽  
Light Region ◽  
Growth Energy

Using vinyl-silsesquioxane modified with various amounts of tetraethoxysilane (TEOS) and titanium tetrabutoxide (TTB), two kinds of hybrid films, film-vinyl-silsesquioxane-TEOS (f-VSTE) and film-vinyl-silsesquioxane-TTB (f-VSTT), were prepared. The average transparency (AT) of the modified films was measured in the ranges of the visible light region (400–750 nm) and in the near-infrared region (750–2500 nm). The AT values in these ranges are about 88% to 94%, indicating that these high-AT films can provide crops with growth energy and improvement of the photosynthetic process efficiency. The TEOS additions result in a hybrid structure (containing SiO2); an adequate addition can cause an increase in the AT radiation from sunlight. On the other hand, the TTB additions result in a hybrid structure (containing TiO2) that causes a decrease in the AT. These results were validated using molecular dynamic simulation and were calculated (with Materials Stutio software) using the density of states and the energy-band structure of the vinyl-SSO, SiO2, and TiO2 building blocks.

scholarly journals Solution-processed near-infrared Cu(In,Ga)(S,Se)2 photodetectors with enhanced chalcopyrite crystallization and bandgap grading structure via potassium incorporation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Joo-Hyun Kim ◽  
Hyemi Han ◽  
Min Kyu Kim ◽  
Jongtae Ahn ◽  
Do Kyung Hwang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Grain Growth ◽  
Carrier Mobility ◽  
Near Infrared ◽  
Low Cost ◽  
Charge Carrier Mobility ◽  
Infrared Region ◽  
Infrared Light ◽  
Large Area ◽  
Solution Processed

AbstractAlthough solution-processed Cu(In,Ga)(S,Se)2 (CIGS) absorber layers can potentially enable the low-cost and large-area production of highly stable electronic devices, they have rarely been applied in photodetector applications. In this work, we present a near-infrared photodetector functioning at 980 nm based on solution-processed CIGS with a potassium-induced bandgap grading structure and chalcopyrite grain growth. The incorporation of potassium in the CIGS film promotes Se uptake in the bulk of the film during the chalcogenization process, resulting in a bandgap grading structure with a wide space charge region that allows improved light absorption in the near-infrared region and charge carrier separation. Also, increasing the Se penetration in the potassium-incorporated CIGS film leads to the enhancement of chalcopyrite crystalline grain growth, increasing charge carrier mobility. Under the reverse bias condition, associated with hole tunneling from the ZnO interlayer, the increasing carrier mobility of potassium-incorporated CIGS photodetector improved photosensitivity and particularly external quantum efficiency more than 100% at low light intensity. The responsivity and detectivity of the potassium-incorporated CIGS photodetector reach 1.87 A W−1 and 6.45 $$\times$$ ×  1010 Jones, respectively, and the − 3 dB bandwidth of the device extends to 10.5 kHz under 980 nm near-infrared light.

scholarly journals Paper-Based Low Cost Optical Filter

2020 ◽  
Author(s):  
Ajay Tripathi ◽  
Rajesh Rawat ◽  
Archana Tiwari
Keyword(s):  
White Light ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Optical Filter ◽  
Infrared Region ◽  
White Paper ◽  
Selective Absorption ◽  
Absorption Mechanism ◽  
Light Emitting

<p>We report simple and inexpensive technique using several sheets of white paper for filtering the blue and non-blue radiation of a white light emitting diode source in the transmission mode. We visibly illustrate successful rejection of specific energy of white light by the filtering papers through absorption mechanism where weak transmission of blue and red radiations are observed. In addition, photoluminescence arising from the papers in near infrared region is also presented while using the white light excitation. Owing to the presence of different whitening agents in the papers, selective absorption and divergent coloured emission from the sheets are observed.</p>

scholarly journals Optical properties of doping electrochromic M0.125W0.875O3 (M=Mo, Nb, Ta, Ti, V): A first-principles study

2020 ◽  
Author(s):  
Yuanyuan Cui ◽  
Qinfan Wang ◽  
Bin Liu ◽  
Yanfeng Gao
Keyword(s):  
Optical Properties ◽  
First Principles ◽  
Near Infrared ◽  
High Efficiency ◽  
Infrared Region ◽  
Smart Window ◽  
Colored State ◽  
Light Region ◽  
Electrochromic Material ◽  
Ti Doping

Abstract Tungsten trioxide (WO3) is a representative electrochromic material that can change their optical properties under the action of a voltage pulse and has attracted great interest in the applications of energy efficient windows. Models of various W0.125M0.875O3 and LixM0.125W0.875O3 (M=Mo, Nb, Ta, Ti, V) were built to simulate the bleached and colored state of WO3 materials by first-principles calculations, respectively. The calculations show that doping systems of LixM0.125W0.875O3 (M= Nb, Ta, V) lead to an enhancement of the modulation efficiency in invisible light and a decrease in the modulation efficiency in near infrared region (NIR). Ti doping boosts an excellent high efficiency of NIR modulation, while no modulation was observed in the visible light region. Mo doping remarkably promotes the coloration efficiency in both NIR and visible regions. The specific characteristics of doped WO3 systems deserve more exploration of their application in green house or thermal modulation smart window.

A smart off–on copper sulfide photoacoustic imaging agent based on amorphous–crystalline transition for cancer imaging

2018 ◽  
Vol 54 (78) ◽  
pp. 10962-10965 ◽  
Author(s):  
Qunfeng Feng ◽  
Yanjun Xu ◽  
Bing Hu ◽  
Lu An ◽  
Jiaomin Lin ◽  
...  
Keyword(s):  
Copper Sulfide ◽  
Near Infrared ◽  
Photoacoustic Imaging ◽  
Cancer Imaging ◽  
Low Cost ◽  
Infrared Region ◽  
Imaging Agent ◽  
Agent Based ◽  
Near Infrared Region

By exploiting the amorphous–crystalline transition of CuS, which results in greatly increased absorption throughout the entire near-infrared region, a novel smart off–on CuS photoacoustic imaging agent with good photostability and low cost is developed.

Facile Synthesis of Conical Arrays with Broadband Antireflective Property

2014 ◽  
Vol 614 ◽  
pp. 79-83
Author(s):  
Wen Yan Zhang ◽  
Ling Yun Hao ◽  
Chun Hua Lu ◽  
Chun Hua Feng ◽  
Qin Lin ◽  
...  
Keyword(s):  
Mass Production ◽  
Smooth Surface ◽  
Near Infrared ◽  
Low Cost ◽  
Infrared Region ◽  
Polydimethyl Siloxane ◽  
Facile Synthesis ◽  
Specular Reflectance ◽  
Regular Shape ◽  
Reflective Property

Conical arrays of polydimethyl siloxane were fabricated by duplicating the morphology of needle tips. The prepared cones have periodic order and regular shape, with the bottom diameter of about 80 μm and height of about 250 μm. Due to their special structure, the conical arrays of polydimethyl siloxane exhibited broadband anti-reflective property. Compared with smooth surface, they could reduce the reflection of incident electromagnetic wave at ultraviolet, visible and near-infrared region. The specular reflectance was lower than 0.75% in the range of 250-2600 nm. The prepared PDMS cones have potential to be applied for antireflective devices. The method was simple for mass production of PDMS cones at low cost.

scholarly journals Paper-Based Low Cost Optical Filter

2020 ◽  
Author(s):  
Ajay Tripathi ◽  
Rajesh Rawat ◽  
Archana Tiwari
Keyword(s):  
White Light ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Optical Filter ◽  
Infrared Region ◽  
White Paper ◽  
Selective Absorption ◽  
Absorption Mechanism ◽  
Light Emitting

<p>We report simple and inexpensive technique using several sheets of white paper for filtering the blue and non-blue radiation of a white light emitting diode source in the transmission mode. We visibly illustrate successful rejection of specific energy of white light by the filtering papers through absorption mechanism where weak transmission of blue and red radiations are observed. In addition, photoluminescence arising from the papers in near infrared region is also presented while using the white light excitation. Owing to the presence of different whitening agents in the papers, selective absorption and divergent coloured emission from the sheets are observed.</p>

scholarly journals Porous carbon aerogel derived from bacterial cellulose with prominent potential for efficient removal of antibiotics from the aquatic matrix

2021 ◽  
Author(s):  
Mengdan Wei ◽  
Huabao Zheng ◽  
Tainan Zeng ◽  
Jian Yang ◽  
Xiaobo Fang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Bacterial Cellulose ◽  
High Performance ◽  
Low Cost ◽  
Hydrophobic Effect ◽  
Carbon Aerogel ◽  
High Specific Surface Area ◽  
Mechanistic Study ◽  
Carbon Aerogels ◽  
Porous Network

Abstract The development of adsorption methods for the remediation of antibiotics pollution in water is hindered by the lack of high-performance sorbents. In this study, a nanofiber carbon aerogel was prepared using bacterial cellulose and its adsorption performances for three common antibiotics (norfloxacin, sulfamethoxazole, and chloramphenicol) in water were evaluated. The as-prepared nanofiber carbon aerogel showed a higher adsorption capacity toward target antibiotics compared to other adsorbents reported in the literature. The maximum adsorption capacities for norfloxacin, sulfamethoxazole, and chloramphenicol were 1,926, 1,264, and 525 mg/g, respectively at 298 K. Notably, the nanofiber carbon aerogel was able to adsorb 80% of the equilibrium adsorption capacity within 1 min and reach equilibrium within 15 min. After five regeneration cycles, the adsorption capacity still reached 1,166, 847, and 428 mg/g for norfloxacin, sulfamethoxazole, and chloramphenicol, respectively. The characterization results showed that the carbon aerogel exhibited a high specific surface area (1,505 m2/g) and a layered porous network structure. Furthermore, the mechanistic study reveals that the enhanced antibiotic adsorption by the as-prepared nanofiber carbon aerogel was attributed to the pore filling effect, hydrogen bonding, hydrophobic effect, electrostatic interaction, and π-π interactions. Overall, these results imply that low-cost and green nanofiber carbon aerogels may be promising adsorbents for the remediation of antibiotic-contaminated wastewater. The materials prepared from natural and readily available bacterial cellulose can adsorb antibiotics efficiently, which provides a reference for the development of adsorbent materials using natural substances.

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