scholarly journals Acid Solution Processed VO2-Based Composite Films with Enhanced Thermochromic Properties for Smart Windows

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4927
Author(s):  
Zhe Wang ◽  
Bin Li ◽  
Shouqin Tian ◽  
Baoshun Liu ◽  
Xiujian Zhao ◽  
...  
Keyword(s):  
Acid Solution ◽  
Near Infrared ◽  
Composite Films ◽  
Solution Process ◽  
Localized Surface Plasmon ◽  
Solar Modulation ◽  
Smart Windows ◽  
Nir Light ◽  
Thermochromic Material ◽  
Thermochromic Properties

As a typical thermochromic material, VO2 coatings can be applied to smart windows by modulating the transmission of near infrared (NIR) light via phase transition. However, the inherent undesirable luminous transmittance (Tlum) and solar modulation efficiency (ΔTsol) of pure VO2 impede its practical application. In order to solve this problem, the porous VO2 based composite film was prepared by magnetron sputtering and subsequent acid solution process with Zn2V2O7 particles used as a sacrificial template to create pores, which showed excellent Tlum (72.1%) and enhanced ΔTsol (10.7%) compared with pure VO2 film. It was demonstrated that the porous structure of the film caused by acid solution process could improve the Tlum obviously and the isolated VO2 nanoparticles presented strong localized surface plasmon resonance (LSPR) effects to enhance the ΔTsol. Therefore, this method will provide a facile way to prepare VO2 based films with excellent thermochromic performance and thus promote the application of the VO2 based films in smart windows.

VO2-ZnO composite films with enhanced thermochromic properties for smart windows

2020 ◽  
Vol 46 (3) ◽  
pp. 2758-2763 ◽  
Author(s):  
Bin Li ◽  
Jiahui Liu ◽  
Shouqin Tian ◽  
Baoshun Liu ◽  
Xinwei Yang ◽  
...  
Keyword(s):  
Composite Films ◽  
Smart Windows ◽  
Thermochromic Properties

Fabrication of the (Y2O3:Yb–Er)/Bi2S3 composite film for near-infrared photoresponse

2015 ◽  
Vol 3 (11) ◽  
pp. 5917-5922 ◽  
Author(s):  
Hong Jia ◽  
Chen Ping ◽  
Cheng Xu ◽  
Jiajia Zhou ◽  
Xiangwen Sang ◽  
...  
Keyword(s):  
Composite Film ◽  
Near Infrared ◽  
Composite Films ◽  
Silar Method ◽  
Current Generation ◽  
Electro Deposition ◽  
Nir Light ◽  
Layer Adsorption ◽  
Light Excitation ◽  
Ionic Layer

Y2O3:Yb-Er/Bi2S3 composite films with photoactive current generation under NIR light excitation were fabricated by electro-deposition and a simple successive ionic layer adsorption and reaction (SILAR) method.

scholarly journals Directed assembly and concentrating of micro/nanoparticles, cells, and vesicles via low-power near-infrared laser generated plasmonic microbubbles

2020 ◽  
Author(s):  
Nareg Ohannesian ◽  
Jingting Li ◽  
Ibrahim Misbah ◽  
Fusheng Zhao ◽  
Wei-Chuan Shih
Keyword(s):  
Surface Plasmon Resonance ◽  
Low Power ◽  
Visible Light ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Near Infrared ◽  
Directed Assembly ◽  
Localized Surface Plasmon ◽  
Nir Light

AbstractDirected assembly and concentrating of micro- and nanoparticles via laser generated plasmonic microbubbles in a liquid environment is an emerging technology. For effective heating, visible light has been primarily employed in existing demonstrations. In this paper, we demonstrate a new plasmonic platform based on nanoporous gold disk (NPGD) array. Thanks to the highly tunable localized surface plasmon resonance of the NPGD array, microbubble of controlled size can be generated by near-infrared (NIR) light. Using NIR light provides several key advantages over visible light in less interference with standard microscopy and fluorescence imaging, preventing fluorescence photobleaching, less susceptible to absorption and scattering in turbid biological media, and much reduced photochemistry, phototoxicity and whatsoever. The large surface-to-volume ratio of NPGD further facilitates the heat transfer from these gold nanoheaters to the surroundings, achieving unprecedented low-power operation. While the microbubble is formed, the surrounding liquid circulates and direct microparticles randomly dispersed in the liquid to the bottom NPGD surface, yielding unique assemblies of microstructures. Such capability can also be employed in concentrating suspended colloidal nanoparticles at desirable sites and with preferred configuration, both enhancing the sensor performance. In addition to various micro- and nanoparticles, the plasmonic microbubbles are also shown to collect biological cells and nanovesicles. By using a spatial light modulator (SLM) to project the laser in arbitrary patterns, parallel assembly can be achieved to fabricate an array of clusters. These assemblies have been characterized using optical microscopy, scanning electron microscope, hyperspectral localized surface plasmon resonance imaging and hyperspectral Raman imaging.

Recent advances in VO2-based thermochromic composites for smart windows

2018 ◽  
Vol 6 (8) ◽  
pp. 1903-1919 ◽  
Author(s):  
Fang Xu ◽  
Xun Cao ◽  
Hongjie Luo ◽  
Ping Jin
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Near Infrared ◽  
Infrared Region ◽  
Metal Phase ◽  
Smart Windows ◽  
Thermochromic Material ◽  
Metal Phase Transition ◽  
Near Infrared Region ◽  
Optical Variation

Vanadium dioxide (VO2) is a well-known thermochromic material since it exhibits a notable optical variation in the near-infrared region from transmitting to reflecting upon the semiconductor-to-metal phase transition (SMT).

Tunable simultaneously visible-light and near-infrared transmittance for VO2/SiO2 composite films to enhance thermochromic properties

2017 ◽  
Vol 209 ◽  
pp. 609-612 ◽  
Author(s):  
Ziyi Cao ◽  
Yuan Lu ◽  
Xiudi Xiao ◽  
Yongjun Zhan ◽  
Haoliang Cheng ◽  
...  
Keyword(s):  
Visible Light ◽  
Near Infrared ◽  
Composite Films ◽  
Infrared Transmittance ◽  
Thermochromic Properties

scholarly journals Porous silver-coated pNIPAM-co-AAc hydrogel nanocapsules

2019 ◽  
Vol 10 ◽  
pp. 1973-1982 ◽  
Author(s):  
William W Bryan ◽  
Riddhiman Medhi ◽  
Maria D Marquez ◽  
Supparesk Rittikulsittichai ◽  
Michael Tran ◽  
...  
Keyword(s):  
Near Infrared ◽  
Localized Surface Plasmon ◽  
Nir Light ◽  
Photothermal Heating ◽  
Vis Spectroscopy ◽  
New Type ◽  
Pass Through ◽  
Porous Silver ◽  
Silver Shell

This paper describes the preparation and characterization of a new type of core–shell nanoparticle in which the structure consists of a hydrogel core encapsulated within a porous silver shell. The thermo-responsive hydrogel cores were prepared by surfactant-free emulsion polymerization of a selected mixture of N-isopropylacrylamide (NIPAM) and acrylic acid (AAc). The hydrogel cores were then encased within either a porous or complete silver shell for which the localized surface plasmon resonance (LSPR) extends from visible to near-infrared (NIR) wavelengths (i.e., λmax varies from 550 to 1050 nm, depending on the porosity), allowing for reversible contraction and swelling of the hydrogel via photothermal heating of the surrounding silver shell. Given that NIR light can pass through tissue, and the silver shell is porous, this system can serve as a platform for the smart delivery of payloads stored within the hydrogel core. The morphology and composition of the composite nanoparticles were characterized by SEM, TEM, and FTIR, respectively. UV–vis spectroscopy was used to characterize the optical properties.

Catalyst Halogenation Enables Rapid and Efficient Polymerizations with Visible to Near-Infrared Light

2020 ◽  
Author(s):  
Alex Stafford ◽  
Dowon Ahn ◽  
Emily Raulerson ◽  
Kun-You Chung ◽  
Kaihong Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Transient Absorption ◽  
Reaction Times ◽  
Infrared Light ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Nir Light ◽  
Light Intensities ◽  
Emission Quenching

Driving rapid polymerizations with visible to near-infrared (NIR) light will enable nascent technologies in the emerging fields of bio- and composite-printing. However, current photopolymerization strategies are limited by long reaction times, high light intensities, and/or large catalyst loadings. Improving efficiency remains elusive without a comprehensive, mechanistic evaluation of photocatalysis to better understand how composition relates to polymerization metrics. With this objective in mind, a series of methine- and aza-bridged boron dipyrromethene (BODIPY) derivatives were synthesized and systematically characterized to elucidate key structure-property relationships that facilitate efficient photopolymerization driven by visible to NIR light. For both BODIPY scaffolds, halogenation was shown as a general method to increase polymerization rate, quantitatively characterized using a custom real-time infrared spectroscopy setup. Furthermore, a combination of steady-state emission quenching experiments, electronic structure calculations, and ultrafast transient absorption revealed that efficient intersystem crossing to the lowest excited triplet state upon halogenation was a key mechanistic step to achieving rapid photopolymerization reactions. Unprecedented polymerization rates were achieved with extremely low light intensities (< 1 mW/cm<sup>2</sup>) and catalyst loadings (< 50 μM), exemplified by reaction completion within 60 seconds of irradiation using green, red, and NIR light-emitting diodes.

Bi19S27I3 nanorods: a new candidate for photothermal therapy in the first and second biological near-infrared windows

Nanoscale ◽  
2021 ◽  
Author(s):  
Jinsong Xiong ◽  
Qinghuan Bian ◽  
Shuijin Lei ◽  
Yatian Deng ◽  
Kehan Zhao ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Research Interest ◽  
The Past ◽  
Nir Light ◽  
Considerable Research ◽  
Key Factor

Near-infrared (NIR) light induced photothermal cancer therapy using nanomaterials as photothermal agents has attracted considerable research interest over the past few years. As the key factor in the photothermal therapy...

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