Journal of Physical Chemistry C
·
2013
·
IF 4.814
Yan Yan,Yafan Wu,Yuting Yan,Weisheng Guan,Weidong Shi
Recently, the controlled synthesis of semiconductor photocatalysts has attracted intense attention. In this report, we first report the controlled synthesis of Bi2WO6 nanostructures via the soluble inorganic salt Na2SO4-assisted hydrothermal method by simply adjusting the reaction time and pH value. Four typical Bi2WO6 nanostructures were obtained, namely nestlike nanostructures assembled by nanoplates (NNS-ANPs), rodlike nanostructures assembled by nanoplates (RNS-ANPs), quantum dots-modified nanoplates (QDs-NPs), and smooth-surfaced nanoplates (SSNPs). Tentative formation mechanisms of the different morphologies based on our observations are discussed. Photocatalytic degradation results show that the degradation ratios (DRs) of three-dimensional structures are higher than those of two-dimensional structures, and surface QDs play key roles in enhancing the DR of QDs-NPs. Morphology-dependent photocatalytic activities of different Bi2WO6 nanostructures are possibly due to different charge-separation abilities, which has been demonstrated by photoluminescence analyses.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Pengxiang Qiu,Jinhua Yao,Huan Chen,Fang Jiang,Xianchuan Xie
ZnIn 2 S 4 /g-C 3 N 4 heterojunction photocatalyst was successfully synthesized via a simple hydrothermal method and applied to visible-light photocatalytic decomposition of 2,4-dichlorophenoxyacetic acid (2,4-D) from aqueous phase. The flower-like ZnIn 2 S 4 particles were dispersed on the surface of g-C 3 N 4 nanosheets in the ZnIn 2 S 4 /g-C 3 N 4 composite. The composite showed higher separation rate of electron-hole pairs as compared to ZnIn 2 S 4 and g-C 3 N 4 . Consequently, the ZnIn 2 S 4 /g-C 3 N 4 composite exhibited enhanced visible light photocatalytic decomposition efficiency of 2,4-D, within 20% ZnIn 2 S 4 /g-C 3 N 4 composite owning the highest photocatalytic efficiency and initial rate. The initial rates of 2,4-D degradation on g-C 3 N 4 , ZnIn 2 S 4 , and 20% ZnIn 2 S 4 /g-C 3 N 4 were 1.23, 0.57 and 3.69 mmol/(g cat h), respectively. The h + and O 2 − were found to be the dominant active species for 2,4-D decomposition. The photocatalytic degradation pathways of 2,4-D by ZnIn 2 S 4 /g-C 3 N 4 under visible light irradiation were explored. The ZnIn 2 S 4 /g-C 3 N 4 composite displayed high photostability in recycling tests, reflecting its promising potential as an effective visible light photocatalyst for 2,4-D treatment.
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高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2015
·Vol. 32
·期 6
·686-692
·
IF 3.081
Xiaoyan Wu,Linlin Liu,Zhicong Deng,Li Nian,Wenzhuo Zhang,Dehua Hu,Zengqi Xie,Yueqi Mo,Yuguang Ma
The “far-field” effect of metal nanoparticles (NPs), when chromophores localized nearby metal NPs (typically the distance > λ /10), is an important optical effect to enhance emission in photoluminescence. The far-field effect originates mainly from the interaction between origin emission and mirror-reflected emission, resulting in the increased irradiative rate of chromophores on the mirror-type substrate. Here, the far-field effect is used to improve emission efficiency of polymer light-emitting diodes (PLEDs). A universal performance improvement is achieved for the full visible light (red, green, blue) PLEDs, utilizing gold (Au) NPs to modify the indium tin oxide (ITO) substrates; this is shown by experimental and theoretical simulation to mainly come from the far-field effect. The optimized distance, between the NPs and chromophores with visible light emission ranging from 400 to 700 nm, is 80–120 nm. Thus the scope of the far-field may overlap the light-emitting profile very well to enhance the efficiency of optoelectronic devices. The 30–40% enhancement is obtained for different color-emitting materials through distance optimization. The far-field effect is demonstrated to enhance device performance for materials in the full-visible spectral range, which extends the optoelectric applications of Au NPs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Benlin Dai,Xin Chen,Xiaofan Yang,Gang Yang,Shijie Li,Lili Zhang,Feihu Mu,Wei Zhao,Dennis Y.C. Leung
A novel S-scheme Au/g-C 3 N 4 /BiO 1.2 I 0.6 plasmonic heterojunction was constructed by calcining a mixture of flower-like BiOI and Au/g-C 3 N 4 nanosheets for the first time. This Au/g-C 3 N 4 /BiO 1.2 I 0.6 heterojunction exhibited excellent photocatalytic activity in bisphenol AF (BPAF) degradation and Cr(VI) reduction with high cycle stability under visible light irradiation. In particular, the photocatalytic performance of the optimum material developed (4-Au/g-C 3 N 4 /BiO 1.2 I 0.6 ) can reach 0.0174 min −1 (apparent rate of BPAF degradation) and 0.0204 min −1 (apparent rate of Cr(VI) reduction), which were 6.5 and 3.7 times that of pristine g-C 3 N 4 , respectively. The high photocatalytic performance was due to the high efficiency of charge separation, the excellent light absorption of localized surface plasmon resonance (LSPR) caused by the Au deposition, and the formation of S-scheme heterojunctions, which maintained strong photocatalytic reduction and oxidation activity. Noticeably, the charge density difference and band offsets of the g-C 3 N 4 /BiO 1.2 I 0.6 were calculated. The results revealed that an internal electric field (IEF) was created, which further demonstrated the formation of an S-scheme photocatalytic mechanism.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 15
·e55221
·
IF 2.7
You Zhang,Wenzhong Ma,Jing Zhong,Ruiqiao Jiang,Zhou Zhou,Sirui Lu,Shuo Wang
As an efficient method to realize photoinduced shape memory, photothermal filler has the characteristics of economy and convenience. However, the aggregation of the photothermal filler in the matrix material will reduce the material's shape memory and mechanical properties. In this work, the photothermal filler of reduced graphene oxide (rGO)-titanium dioxide (TiO 2 ) was prepared by the solvothermal method and then introduced into the polycaprolactone (PCL) matrices to construct a photoresponsive actuator. Because of TiO 2 is uniformly loaded on the rGO surface, rGO-TiO 2 disperses well in the composites. When the GO:TiO 2 ratio of photothermal filler is 1:1, the mechanical properties of PCL-GT-3 are the best, and the tensile strength and elongation at break are 31.8 MPa and 239.5%, respectively, and the crosslinking material under near-infrared light has a good photothermal effect. Due to the induced difference between the in-plane stress of the surface and the volume layer, the shape transformation can be controlled by very low energy (808 nm, 700 mW near-infrared laser). The scheme of controlling the properties of the photoinduced shape memory material by changing only the filler type is conducive to commercial application.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Qian Wen Cao,Yi Fan Zheng,Xu Chun Song
The efficient visible-light-driven AgIO 3 /AgBr photocatalyst was successfully synthesized by an in-situ anion-exchange method at room temperature. The scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflection spectroscopy (DRS) were used to characterize the obtained samples. The photocatalytic activities of the as-prepared heterojunctions were estimated by decomposing the organic dye RhB under visible-light irradiation ( λ > 420 nm). Compared with pure AgBr and AgIO 3 , the AgIO 3 /AgBr compounds showed dramatically improved visible-light photocatalytic activity. Besides, the results also revealed that 20% AgIO 3 /AgBr exhibited the best photocatalytic activity, which could decompose the RhB completely in 24 min. The enhanced photocatalytic activity of the composites could be ascribed to the high separation rate of the photoinduced electron–hole pairs in the heterojunction structure. Moreover, the radical trap experiments were also carried out which confirmed that h + played the major role in RhB photodegradation . The possible mechanism of RhB degradation on the AgIO 3 /AgBr composite was also discussed according to the results of the experiments and the performance of the obtained photocatalysts.
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BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Zhao Xue,Wenxin Chou,Yixuan Xu,Ziyi Cheng,Xuechun Ren,Tianzhen Sun,Wenbin Tong,Yang Xie,Junyu Chen,Nuohan Zhang,Xing Sheng,Yongtian Wang,Hongyou Zhao,Jian Yang,He Ding
Light therapy is an effective approach for the treatment of a variety of challenging dermatological conditions. In contrast to existing methods involving high doses and large areas of illumination, alternative strategies based on wearable designs that utilize a low light dose over an extended period provide a precise and convenient treatment. In this study, we present a battery-free, skin-integrated optoelectronic patch that incorporates a coil-powered circuit, an array of microscale violet and red light emitting diodes (LEDs), and polymer microneedles (MNs) loaded with 5-aminolevulinic acid (5-ALA). These polymer MNs, based on the biodegradable composite materials of polyvinyl alcohol (PVA) and hyaluronic acid (HA), serve as light waveguides for optical access and a medium for drug release into deeper skin layers. Unlike conventional clinical photomedical appliances with a rigid and fixed light source, this flexible design allows for a conformable light source that can be applied directly to the skin. In animal models with bacterial-infected wounds, the experimental group with the combination treatment of metronomic photodynamic and light therapies reduced 2.48 log 10 CFU mL –1 in bactericidal level compared to the control group, indicating an effective anti-infective response. Furthermore, post-treatment analysis revealed the activation of proregenerative genes in monocyte and macrophage cell populations, suggesting enhanced tissue regeneration, neovascularization, and dermal recovery. Overall, this optoelectronic patch design broadens the scope for targeting deep skin lesions, and provides an alternative with the functionality of standard clinical light therapy methods.
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高影响因子
Green Synthesis and Catalysis
·
2022
·
IF 0
Hongwei Li,Yurong Zhang,Jun Tang,Guozheng Huang,Ping Cui,Qingping Ke
Developing highly efficient and recyclable photocatalysts through harvesting solar light as energy is crucial to oxidation for industrial implementation, especially for simple transition metal oxidic catalysts without precious/heavy/rare metal dopants. Herein, we like to report the use of nitrogen-doped CoMn 2 O 4 oxide ( N –CoMn 2 O 4 ) as a heterogeneous catalyst for efficient oxidation of various alcohols such as p / m / o -methyl-substituted aromatic alcohols, p -substituted aromatic alcohols including electron-donating and electron-withdrawing substituents, heterocycle-based alcohols and secondary aromatic alcohols to the corresponding aldehydes/ketones, under visible light (>420 nm) illumination and mild condition of oxygen as oxidant and room temperature. The relation of various Co-based oxides to their catalytic performance was studied. It is shown that the Co 2+ species in N –CoMn 2 O 4 , obviously increased by the doping of nitrogen, are acted as catalytic active species coupled with the synergistic effect between Co and Mn species for the enhanced visible-light selective oxidation of alcohols to aldehydes. A plausible catalytic mechanism is proposed basis of control experiments and published studies, which suggests that this oxidation process probably occurs on Co 2+ sites via an ionic reactive oxygen species pathway and 1 O 2 and O 2 · − species are the reactive oxygen species. This simple transition metal oxide-catalyzed aerobic oxidation provides a green alternative for the manufacture of aldehydes/ketones from alcohols.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 39
·18615-18622
·
IF 3.591
Xuecheng Liu,Ling Gao,Gaoxiang Qi,Jie Zhang,Biyan Liu,Yucheng Chen
A heterojunction structure LaVO4/g-C3N4 composite with oxygen defects was successfully prepared. The characterization results show that the recombination of electron–hole pairs could be inhibited by the heterojunction structure. The LaVO4/g-C3N4 composite shows superior photocatalytic water splitting performance for the generation of hydrogen and oxygen under visible light irradiation. Experimental data show that under visible light irradiation, the hydrogen and oxygen evolution rates of the LVOCN1 composite are much higher than those of fresh carbon nitride. Moreover, the photocatalytic activity of LaVO4/g-C3N4 composites could be significantly enhanced by O defects. Mechanism studies display that the possible mechanism of the photocatalytic water splitting reaction is the Z scheme mechanism.
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高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 6
·2102238
·
IF 10.05
Shuangshuang Wang,Jiacheng Yao,Xiaolin Lu,Tao Ding
Gold nanowires (AuNWs) have been one of the key components for nanoelectronics and optoelectronic devices but the fabrication has been poorly customized for this purpose even though diverse synthetic strategies bloomed over the last decades. Here, the concept of light-induced protrusion of AuNWs directly from solid state substrate is demonstrated, which is highly compatible for on-chip fabrication of functional nanodevices. This is realized by irradiating the Au ion-doped titanium dioxide (TiO 2 ) films with continuous wave laser. The blue laser triggers the reduction and nucleation of Au(0) which grows vertically into AuNW bundles with diffusion-controlled supply of Au ions within the TiO 2 matrix. Thus, the morphology of the AuNWs can be tuned with irradiation time/power as well as the ion concentration, which can derive into Au nanorings (NRs) and NR stacks in 1D photonic crystal with reduced plasmon linewidth. Such light-induced protrusion can also generate nanopillars by introducing Au seeds before irradiation. The surface-enhanced Raman scattering performance of the AuNW bundles is excellent with f m detection limit. Such laser-directed solid-state growth technique is facile, versatile, cost-effective site-selective, ligand-free, and wafer-scalable, which opens up many promising applications in (bio)chemical sensing, photovoltaics, photocatalysis, plasmonic displays, and integrated nanoelectronic/optoelectronic devices.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 13
·10657-10668
·
IF 2.22
Li Lingjiao,Xu Jing,Li Xuanhao,Liu Zeying
Previous reports indicate that the catalyst Cd x Zn 1− x S shows good activity and reliability in the process of photocatalytic hydrogen production. However, it is still a challenge to design a cost-effective catalyst to replace the traditional Cd x Zn 1− x S. In this work, Roman broccoli Cd 0.8 Zn 0.2 S-2 was successfully prepared through reasonable adjustment and control of the amount of raw materials. In the photocatalytic hydrogen evolution test, the amount of hydrogen evolution of CZS-2 was 1.24, 1.34, 2.06, and 2.24 times that of CZS-1, CZS-3, CZS-4, and CZS-5, respectively. This is because Cd 0.8 Zn 0.2 S-2 has more excellent synergy inside. Theoretical and experimental studies show that, based on rational design, the optical and electrical properties of the CZS-2 structure have been substantially improved (based on UV–Visible diffusion and photoluminescence). The mechanism of the study shows that the photocatalytic hydrogen evolution activity of CZS-2 is effectively improved due to the favorable energy band of effective charge transfer inside CZS-2. In this work, Roman broccoli-like CZS-2 provides a new research direction for photocatalytic water decomposition.
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高影响因子
Research
·
2021
·
IF 0
Wei Shen,Jianbin Zhang,Ruimin Dong,Yanfeng Chen,Liu Yang,Shuo Chen,Zhan Su,Yujun Dai,Kun Cao,Lihui Liu,Shufen Chen,Wei Huang
α-CsPbI3 nanocrystals (NCs) with poor stability prevent their wide applications in optoelectronic fields. Ca2+ (1.00 Å) as a new B-site doping ion can successfully boost CsPbI3 NC performance with both improved phase stability and optoelectronic properties. With a Ca2+/Pb2+ ratio of 0.40%, both phase and photoluminescence (PL) stability could be greatly enhanced. Facilitated by increased tolerance factor, the cubic phase of its solid film could be maintained after 58 days in ambient condition or 4 h accelerated aging process at 120°C. The PL stability of its solution could be preserved to 83% after 147 days in ambient condition. Even using UV light to accelerate aging, the T50 of PL could boost 1.8-folds as compared to CsPbI3 NCs. Because Ca2+ doping can dramatically decrease defect densities of films and reduce hole injection barriers, the red light-emitting diodes (LEDs) exhibited about triple enhancement for maximum the external quantum efficiency (EQE) up to 7.8% and 2.2 times enhancement for half-lifetime of LED up to 85 min. We believe it is promising to further explore high-quality CsPbI3 NC LEDs via a Ca2+-doping strategy.
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