CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Bingbing Cui,Chuanpan Guo,Zhihong Zhang,Guodong Fu
Heterojunction engineering is an acceptable strategy in promoting the separation efficiency of electron/hole pairs in the photochromic process. Here, a series of novel solid-state photochromic ZnCo-PBA@WO 2.72 heterojunctions have been designed and prepared in the current study. The cubic ZnCo-PBA were selected as templates to directly grow WO 2.72 amorphous layer using phosphotungstic acid (PW 12 ) as precursors with the assistance of polyvinyl pyrrolidone (PVP). The as-obtained ZnCo-PBA@WO 2.72 heterojunctions have a core–shell structure and the appropriate band energy promote the UV-generated electrons transport from ZnCo-PBA to WO 2.72 . Consequently, the ZnCo-PBA@WO 2.72 heterojunctions exhibit excellent photochromic performance, converting from white to light-grey in 10 s and finally turning into dark-grey in 60 s under UV lamp stimulation. Meanwhile, the WO 2.72 outer layer was more easily in contact with oxygen in air and thus speeds up the oxidation process of W 5+ to W 6+ , allowing the colored ZnCo-PBA@WO 2.72 heterojunctions to return to their original colorless condition within 15 min. The solid-state photochromic ZnCo-PBA@WO 2.72 heterojunctions was then used as repeatable information storage media, data encryption and decryption based on coloration-decoloration behaviors. This study presents a meaningful way to integrate WO 2.72 with MOFs to expand the range of photochromic materials and further to broaden theirs application in optical devices.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xiangyu Tian,Zixu Zeng,Yi He,Lecheng Lei,Chunlin Yu,Xingwang Zhang
The utilization of TiO 2 for the fabrication of transparent photochromic materials is both cost-effective and environmentally friendly. However, it still poses challenges due to the rapid recombination of electron-hole pairs and poor organic-inorganic compatibility. Oxygen vacancies play a crucial role in sustaining sacrificial electron donors for hole scavenging, demonstrating great potential in enhancing photochromic performance. Herein, Rb doping and lattice strain are applied to synergistically engineer oxygen vacancies, considering lattice oxygen release is influenced by charge neutrality and oxygen atom coordination environment. Furthermore, the particle surface is modified using composite siloxanes to ensure monodispersion and enhance organic-inorganic compatibility. Structural analyses and theoretical calculations indicate that Rb doping and epitaxial strain synergistically reduce the oxygen vacancy formation energy and promote the chemical adsorption of diethylene glycol (DEG) on the TiO 2 surface for hole scavenging. The designed DEG-added Rb-TiO 2 /TB-CS (TB means extra titanium butoxide, CS means composite siloxanes) nanodispersion exhibits a significant optical modulation amplitude exceeding 90% at 650 nm, rapid response within 60 s, and stable reversibility in color-switching (50 cycles). Moreover, utilizing Rb-TiO 2 /TB-CS with DEG ligands as a responsive material enables the fabrication of transparent photochromic polyacrylate-based hybrid films, polyvinyl alcohol-based hydrogels, and hydroxyethyl cellulose-based rewritable papers, showcasing its immense potential for diverse applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 27
·10218-10225
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IF 5.7
Tingfeng Ma,Bin Li,Yongkang Zhu,Senwei Wu,Xiujian Zhao,Xinhong Chu,Shouqin Tian
Tungsten oxides have attracted much attention and research in the field of photochromic smart windows, but their application is limited by their slow light response and poor reversibility. In order to overcome the limitations, Zn2+-doped W18O49 nanoparticles were prepared using a facile hydrothermal method and they exhibited good photochromic performance with a quick coloring rate under UV irradiation because more oxygen vacancies in the crystal lattice caused by Zn doping could facilitate the reduction of W6+ to W5+, which was confirmed from XRD and XPS results. In addition, the Zn-doped W18O49 nanoparticle-based films showed excellent photochromic properties with a high visible transmittance (Tlum) of 85.33%, a large solar modulation efficiency (ΔTsol) of 47.18% and a fast photochromic speed (3 min) as well as good cycling stability. These properties are better than those reported in most previous works. Therefore, this work can provide a promising photochromic material with high performance for smart windows.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
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IF 5.1
Yongkang Zhu,Bin Li,Chenxu Li,Shouqin Tian
Recently, tungsten oxides have attracted extensive attention in the field of photochromic smart windows due to the naturally ultraviolet response, high luminous transmittance (Tlum), and substantial solar light modulation (ΔTsol). To promote its applications, limitations such as slow bleaching speed and poor reversibility need to be addressed urgently. Here, we proposed a Fe3+-doping mediated rapid electron transfer strategy to improve the overall photochromic performance of W18O49. By increasing the Fe3+ doping concentration, the bleaching speed of W18O49 films was significantly improved. Notably, films doped with 6 at% and 8 at% Fe3+ could be fully bleached within 5 min, with bleaching rates twice that of undoped films. This improvement is attributed to Fe3+ doping, which creates more oxygen vacancies in W18O49, facilitating the reduction of W6+ to W5+. Furthermore, the 6 at% Fe3+-doped W18O49 bilayer film exhibited excellent photochromic performance, with the ultrahigh Tlum and ΔTsol of 82.9% and 60.2%, respectively, fast photochromic speed (within 2 min), and nearly complete near-infrared light blocking in the colored state. These findings demonstrate the potential of Fe3+-doped W18O49 to significantly improve the performance of photochromic smart windows, offering promising avenues for energy-efficient building technologies.
研究领域:
材料科学
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能源技术
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光学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2023
·Vol. 11
·期 28
·9570-9577
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IF 6.4
Na Chen,Wan-Xiong Yong,Tuo-Dong Xiong,Guo-Dong Fu
The development of viologen-based photochromic composite materials with a fast response to ultraviolet light has become a major research focus. In this paper, we fabricated viologen-based composite films with excellent durability and rapid photochromic performance by the solution casting method. The films changed color within one second when exposed to ultraviolet light (3 W, 365 nm). This was because ZnO NPs photogenerated electrons that enhanced the photoreduction of viologens with matched energy bands. The decoloration process of the films could be regulated by different moisture levels while keeping their photochromic properties unaffected. Moreover, the films exhibited less than 15% change in absorbance over 20 repeated coloring and fading cycles. Therefore, the excellent photoresponsiveness, repeatability and environmental friendliness of the films provide them potential for applications in areas such as rewritable paper, solar UV detection, smart windows and anti-counterfeiting.
研究领域:
材料科学
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光化学
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环境科学
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产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2016
·
IF 1.947
Ji-Xi Guo,Ming-Xi Guo,Dian-Zeng Jia,Yin-Hua Li
Novel photochromic composite films have been successfully fabricated by dispersing pyrazolone derivative: 1,3-Diphenyl-4-(3-chlorobenzal)-5-hydroxypyrazole 4-phenylsemicarbazone ( 1a ) into hydrosol of polyvinyl alcohol (PVA). The microstructure, photochromic behaviors and thermal bleaching properties were investigated by Raman spectroscopy, X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and ultraviolet–visible absorption spectroscopy (UV–vis). The results showed that 1a was not only blended but also well dispersed in the PVA polymer films with a suitable content of chromophore. Upon UV light irradiation, the composite films gradually changed from colorless to yellow and recovered fully to the initial state upon thermal bleaching. The time constants of photochromic reactions were almost the same as those of 1a observed in their crystalline state, indicating that the photochromic phenomenon is barely disturbed by the polymer matrix.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 5
·期 2
·427-433
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IF 5.066
Rongguo Wang,Xiaolong Lu,Lifeng Hao,Weicheng Jiao,Wenbo Liu,Jian Zhang,Feng Yuan,Fan Yang
Orthorhombic molybdenum trioxide (α-MoO3) as one kind of potential inorganic photochromic material shows a slow response, poor reversibility and monotonic coloration. Here, we provide an efficient way to improve and tune the photochromism of MoO3. Novel inorganic–organic hybrid composites were successfully prepared by intercalating n-butylamine into the layer space of α-MoO3 and enhanced photochromic properties such as a fast response, superior reversibility, and good stability were achieved. Meanwhile, the solutions of as-prepared hybrids showed solvent-dependent discoloration due to the hole scavenger effect of ethanol. A reversible transformation between an intermediate state and an enhanced, but stable state was realized by switching irradiation. The improved photochromism caused the solutions of hybrids to show diverse discoloration varying from yellow to green to blue color.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2021
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IF 7.267
Pan Zhang,Yuanyuan Cui,Yongji Yao,Wei Wei,Yuanyuan Sun,Kaiqiang Zhang,Yanfeng Gao
Developing cheap and efficient materials for enhancing the photochromic performance upon visible or solar light irradiation is a hot-topic in the field of solar energy conversion . However, few inorganic photochromic materials can provide satisfying applications due to their low coloring and bleaching efficiency as well as slight color change. Here, we synthesized the bismuth tungstate (Bi 2 WO 6 ) ultrathin nanosheets with the thickness of 1.29 nm via co-precipitation-hydrothermal method using cetyltrimethylammonium bromide (CTAB) surfactant . The prepared ultrathin nanosheets show the similar crystalline structure but a narrowed band gap of 2.73 eV, as compared with the 2.86 eV of pristine Bi 2 WO 6 . Additionally, the numerous [WO 6–x Br 2x ] species and abundant “Bi–O″ vacancy pairs on the surface can serve as active sites that suppress the recombination of photogenerated electron-hole pairs and capture the photogenerated electrons to form the color trapping centers. As a result, Bi 2 WO 6 ultrathin nanosheets exhibit excellent photochromic behavior upon solar light irradiation (coloring time of 5 s) and under dark atmospheric treatment (bleaching time of 35 min) compared with WO 3 -based photochromic materials (coloring time of 20–60 min and bleaching time of 3 h days).
研究领域:
材料科学
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太阳能转换
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纳米技术
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产品关联
DOI
高影响因子
LANGMUIR
·
2018
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IF 3.789
Yan Yang,Ting Zhang,Jiajin Yan,Liuwa Fu,Hongping Xiang,Yanyan Cui,Jiahui Su,Xiaoxuan Liu
In this study, spiropyran (SP)-containing fluorinated polyacrylate (F-PA–SP) latex was prepared by emulsion polymerization using fluorinated and SP-based acrylic monomers as raw materials. Fourier transform infrared and 1H NMR demonstrate that the F-PA–SP copolymer has been successfully synthesized, and dynamic light scattering and transmission electron microscopy analyses indicate that the synthesized latex has presented a uniform particle size of approximately 200 nm. X-ray photoelectron spectroscopy, atomic force microscopy, and water contact angle (WCA) analyses were used to investigate the surface properties of the F-PA–SP coating and demonstrate that its hydrophobicity is enhanced by the addition of a fluorinated acrylic monomer. The photochromic properties of the coating were investigated by UV/vis spectroscopy, and the results reveal that the F-PA–SP coating possesses better photoresponsiveness, fatigue resistance, and photoreversibility under UV/vis irradiation than the coating prepared using fluorinated polyacrylate/SP blended latex. Moreover, the WCA of the F-PA–SP coating subjected to UV/vis irradiation shows minimal changes and retains its excellent hydrophobicity. Finally, the F-PA–SP latex was applied to cellulosic paper, and the resulting photochromic paper exhibits outstanding reversible color changes and hydrophobicity.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 7
·3215-3223
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IF 3.5
Yue-Chen Chen,Yi-Ming Di,Shu-Quan Zhang,Mei-Jin Lin
As an emerging class of hybrid complexes, donor–acceptor (D–A) hybrid heterostructures, which combine the advantages of both organic and inorganic photoactive components, provide excellent platforms for the fabrication of photochromic materials with enhanced photo-responsive performances. Herein, four novel hybrid heterostructures, namely H3TPT·(PW12O40)·2NMP (1), (H1.5TPT)2·(PW12O40) (2), (H3TPT)2·(SiW12O40)·2Cl·2MeCN (3), and H3TPT·(HPMo12O40)·Cl·3NMP (4) (TPT is tri(4-pyridyl)-s-triazine, NMP is N-methylpyrrolidone), have been synthesized and characterized. Benefitting from the strong interactions (anion–π interactions) and matching electron energy levels between the donors and acceptors, some of them exhibited ultrafast photochromic behaviour even up to 1 second. Furthermore, based on experimental and theoretical calculations, the plausible PIET process and structure–activity relationship have been discussed in detail.
研究领域:
材料科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2018
·
IF 0.668
Qian Zhao,Yanhua Yang,Kecheng Shen,Xian Tao,Yingzhong Shen
Three novel types of naphthopyran derivatives containing alkoxyl and phenyl moieties, 13-butyl −6,11-dimethyl-3,3-diphenyl-3,13-dihydrobenzo[h]indeno[2,1-f]chromen-13-ol (NP), 13-butyl-3,3-bis(6-methoxy-[1,1′-biphenyl]-3-yl)-6,6-dimethyl-3,13-dihydrobenzo[h] indeno[2,1-f]chromen-13-ol (NP1) and 13-butyl-3,3-bis(6-methoxy-4′-naphthalenyl-[1,1′-biphenyl]-3-yl)-6,11-dimenthyl-3,13-dihydrobenz[h]indeno[2,1-f]chromen-13-ol (NP2), were synthesised and characterised. Measurements indicated that they possessed an excellent photochromic response, a rapid thermal bleaching rate and good fatigue resistance. Meanwhile, the UV maximum absorption wavelengths of NP1 (562 nm) and NP2 (597 nm) appeared bathochromically shifted compared with NP (536 nm). The bleaching rate of NP1 was found to be approximately twice that of NP. The results indicated that the UV maximum absorption wavelength and bleaching rate increase with increasing length of the phenyl side chain moieties. In PMMA film, the compounds showed almost the same photochromic properties in the solid state as in dichloromethane solution. The UV absorbance with high-contrast switching in solid film could be beneficial for practical applications.
研究领域:
有机化学
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6386-6396
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IF 3.591
Guangyao Li,Zhicheng Pan,Zhanyu Jia,Juan Wang,Jianlong Wang,Ning Zhang,Mingwang Pan,Jinfeng Yuan
Photochromic hydrogels have attracted widespread attention due to their potential applications in optical devices. Spiropyran (SP) is one of the most investigated organic photochromic compounds and has high sensitivity towards a wide range of stimuli. However, it generally requires sophisticated chemical modification for its incorporation into hydrogels as a functional monomer. In addition, the relatively poor mechanical property is a key limitation with the use of hydrogels in many applications. Herein, we provide an effective approach to directly incorporate the SP photochromic group into a polyurethane hydrogel without any modification. A new type of photochromic polyurethane hydrogel that has excellent photochromic and mechanical properties was successfully prepared. Due to the isomerization reaction of the reversible Cspiro–O bond provided by SP, the hydrogel demonstrated a noticeable and reversible color change on adjusting the SP content. The incorporation of SP significantly improved the mechanical properties of the PU hydrogel; the tensile strength (3.41 MPa) and the high elastic modulus (4.29 MPa) of the PU-SP hydrogel increased 5.4-fold and 9.5-fold, respectively, as compared to the PU hydrogel under the same –NCO to –OH ratio. Moreover, the PU-SP hydrogel has a good reversible photochromic property, which can easily achieve repeated erasing and rewriting. In summary, our present work provides an effective approach to prepare a high-strength and light-responsive photoswitch polyurethane hydrogel through SP without further chemical modification, which may have broad application prospects in wearable soft sensors, erasable optical displays and artificial intelligence systems.
研究领域:
材料科学
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聚合物化学
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光电学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）