LANGMUIR
·
2020
·
IF 3.557
Xiaoran Wu,Xiang Xue,Jinghang Wang,Hewen Liu
Phoretic swarming and collective transport of colloidal particles in response to environmental stimuli have attracted tremendous interest in a variety of fields. In this work, we investigate the light-actuated motion, aggregation, and light-guided long-distance mass transport of silica microspheres in simple spiropyran solutions under the illumination of UV spot sources. The phototactic motion is confirmed by the dependence of swarming on the illumination intensity and spiropyran concentrations, ON–OFF switching tests, pattern-masked UV sources, etc. The aggregates formed via swarming of silica spheres can chase after a moving UV source, however, relying on a critical speed of the UV source. Only when the UV source speed is below the critical value, the aggregates follow the UV spot at a constant relative speed to the light spot. Analysis on the shape of silica microsphere currents indicates that continuous illumination of the UV spot source and resultant chemical gradients are important for the formation of steady microsphere currents. Light-guided aggregation and long-distance mass transport are interesting for targeted delivery and remote-controlled enrichment of environmental hazards.
研究领域:
材料科学
·
物理学
·
化学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2020
·Vol. 7
·期 14
·2000439
·
IF 15.84
Jundong Shao,Changshun Ruan,Hanhan Xie,Paul K. Chu,Xue-Feng Yu
The photochemical activity of black phosphorus (BP) in near-infrared (NIR) light controlled in situ biomineralization is investigated. Owing to the excellent NIR absorption, irradiation with NIR light not only promotes degradation of BP into PO 4 3− , but also enhances the chemical activity to accelerate the reaction between PO 4 3− and Ca 2+ and promote in situ biomineralization. Mineralization of hydrogels is demonstrated by the preparation of BP incorporated hydrogel (BP@Hydrogel) which delivers greatly improved biomineralization performance under NIR illumination. The biomineralization process which can be controlled by modulating the light irradiation time and location has a high potential in controlling the mechanical properties and osteoinductive ability in tissue engineering. This study also provides insights into the degradation, photochemical activity, and new biological/biomedical applications of BP.
研究领域:
材料科学
·
生物医学工程
·
光化学
✓ 已验证
DOI
高影响因子
Nano Select
·
2024
·
IF 0
Zhiyu Zhang,Fei Long,Yanhong Guo,Yunxiao Liang,Jing Wang,Yong Ren
The large-sized nanofilm-constructed hierarchical porous SiO 2 (LNCHPS) is successfully prepared by the dual templating approach and subsequently used as the support for g-C 3 N 4 . A series of characterization techniques are conducted to evaluate the structure and property of the as-prepared materials. The LNCHPS possesses two sets of explicated successive pass-through macropores (0.5–1.0 µm) with large specific surface area. In addition, the macropore wall is constructed by uniform mesoporous nanofilms with the thickness ranging from 35 to 50 nm. Then, the photocatalytic property is investigated by degradations towards Rhodamine B (RhB) under simulated sunlight, in which experiments have been performed through controlling the g-C 3 N 4 loading contents, solution pH values, and photocatalyst dosages. The apparent rate constant of g-C 3 N 4 /LNCHPS could reach 0.03 min −1 under optimum conditions, showing 6.0 times that of the bulk g-C 3 N 4 . In addition, g-C 3 N 4 /LNCHPS also exhibits significantly enhanced performance in H 2 evolution (39.9 µmol h −1 ) compared to that of the bulk g-C 3 N 4 . High light absorption and utilization, enhanced adsorption capability and quick electron hole separation can render this fine structure excellent photocatalytic performance. Our work enables a facile route for large-scale preparation of g-C 3 N 4 /LNCHPS for addressing the wastewater treatment and hydrogen energy production simultaneously.
研究领域:
材料科学
·
环境科学
·
能源技术
✓ 已验证
DOI
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 12
·8191-8205
·
IF 3.5
Haozhang Liang,Xiangtao Lin,Nanshan Ma,Longqing He,Juxia Tong,Zhiwei Luo,Lingying Ye,Anxian Lu
The Er 3+ /Yb 3+ co-doped tellurite glasses and glass-ceramics (GCs) containing the Gd 2 Te 6 O 15 phase were successfully fabricated via the conventional melting-quenching technique followed by a crystallization regime. The Er 3+ /Yb 3+ co-doped tellurite glasses generated intense up-conversion green (524 and 546 nm) and red (658 nm) emissions when stimulated by a 980 nm laser. The up-conversion green emission intensity increased by 68 and 46 times with the increase of the Yb 3+ /Er 3+ ratio, and the optimal Yb 3+ /Er 3+ ratio was found to be 8:1. The surface crystallization process of the Gd 2 Te 6 O 15 GCs was confirmed through analysis of crystallization kinetics and microscopic morphology. The up-conversion luminescence and lifetime of Er 3+ ions were enhanced by the precipitation of low-phonon-energy Gd 2 Te 6 O 15 crystals. The GC sample crystallized at 480°C for 4 h showed the highest luminescence intensity. The optical thermometry properties of Er 3+ ions at thermally coupled energy levels ( 2 H 11/2 / 4 S 3/2 → 4 I 15/2 ) were explored. The Gd 2 Te 6 O 15 GCs co-doped with 0.25 mol% Er 2 O 3 and 2.0 mol% Yb 2 O 3 exhibited an excellent temperature relative sensitivity ( S r ) of 1.22% K −1 at 293 K and a great repeatability of 98.07%. These results suggest that the Er 3+ /Yb 3+ co-doped Gd 2 Te 6 O 15 GCs show promise for optical thermometry.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·
IF 9.6
Li Jiang,Fang Yu-Chen,Wang Xiao,Ding Ling-Tong,Wang Zhi-Jun,Yang Xin-Yao,Lancok Jan,Li Wei-Min,Zhong Gao-Kuo,Wang Xin,Xing Zheng,Zhao Shen,Liu Shu-De,Long Xia,Ma Ming
Typical p-n junctions have emerged as a promising strategy for contending with charge carrier recombination in solar conversion. However, the photo-corrosion and unsuitable energy band positions still hinder their practical application for hydrogen production from water in photoelectrochemical systems. Here, an in-situ photo-oxidation method is proposed for achieving self-adapting activation of BiVO 4 -based photoanodes with surface-encapsulated CuGaS 2 particles by the ZnO layer. The self-adapting activation demotes the energy band positions of CuGaS 2 , establishing an S-scheme structure with BiVO 4 , resulting in an efficient p-n junction photoanode. The optimal sample exhibits enhanced photocurrent and an onset potential cathodically shifted by ~ 300 mV compared with BiVO 4 , which is attributed to significantly enhanced charge transport and transfer efficiencies. As expected, it attains the highest photocurrent value of 5.87 mA·cm −2 , aided by a hole scavenger at 1.23 V versus a reversible hydrogen electrode, which significantly surpasses that of BiVO 4 (4.32 mA·cm −2 ).
研究领域:
材料科学
·
能源科学
·
催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongbo Liu,Xu Wang,Chaoyong Deng,Min Zhang
In this investigation, the photoluminescence properties, energy transfer phenomenon of BaY 2 ZnO 5 :Sm 3+ /Eu 3+ doped/co-doped phosphor are reported and synthesized by high temperature solid state reaction method. The crystal structure, micromorphology, optical diffuse reflectance and photoluminescence properties of the samples were studied. The results show that concentration quenching phenomenon is found. With the increase of Eu 3+ ion concentration, the emission peaks of Sm 3+ gradually decrease, indicating that energy transfer between Sm 3+ and Eu 3+ . The optimal concentrations are 0.05 mol and 0.2 mol for single doping Sm 3+ and Eu 3+ , respectively. The energy transfer efficiency is calculated to be 78.47–95.19 %. The BaY 2 ZnO 5 phosphors have potential application value in the fields of white light LEDs and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 7
·075004
·
IF 2.352
Yefeng Chen,Dan Tang,Zhuhan Wang,Wen Li,Mengyun Yin,Qin Yang,Yafen Zhou,Kaiming Zhang,Taotao Kan,Limei Zhou
As an important intermediate, imine is widely used in industrial chemistry. The photocatalytic oxidation of amines to form imines is a green and economical method. But it remains a challenge for the efficient transformation under mild conditions. Herein, a Z-scheme carbon nitride (CM)-Fe2O3 heterojunction photocatalyst was synthesized by in-situ preparation of Fe2O3 nanoparticles on two-dimensional CM nanosheets. The as-prepared catalyst exhibited efficient photocatalysis activity in selective oxidation of benzylamine to N-benzylidene benzylamine. Under ambient air and room temperature, the selectivity and conversion rate both can reach 99.9%, and the corresponding turnover frequency value reaches up to 9.99 mmol g−1 h−1, superior to the most of heterogeneous photocatalysts reported in previous literatures. The excellent catalytic activity of the modified CM material may be due to the enhanced absorption of visible light and the improved photogenerated carrier separation and migration rate, and the Z-scheme mechanism also retains the strong oxidation and reduction ability of the composite material. This work will provide a promising and practical method to promote the photocatalytic conversion of solar-driven organics.
研究领域:
材料科学
·
环境化学
·
光催化技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Zhiqiao He,Lixian Jiang,Da Wang,Jianping Qiu,Jianmeng Chen,Shuang Song
A series of fluorinated anatase TiO2 nanosheets with dominant {001} facets were synthesized to oxidize p-chlorophenol (PCP) and reduce Cr(VI) simultaneously under visible light. The {001}/{101} surface facets ratio of TiO2 was controlled by varying the initial HF concentration, and fluorine-free samples were obtained by alkaline-washing. A synergistic effect among TiO2, Cr(VI), and PCP was observed, which is ascribed to effective trapping of photogenerated electrons and holes by Cr(VI) and PCP, respectively. A maximum synergistic effect was obtained at a molar ratio of [PCP] to [Cr(VI)] of one. Using X-ray diffraction, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller analyses, the optimum ratio of exposed {001} to {101} facets for TiO2 was determined to be 80:20 because of selective transfer and charge balance of photogenerated carriers. Surface fluorination facilitates the formation of oxygen vacancies and unsaturated Ti atoms, which is useful for visible light activity induction, extending the lifetime of photogenerated electron-hole pairs, and enhancing the rate of PCP oxidation and Cr(VI) reduction.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Chinese Physics B
·
2023
·Vol. 32
·期 1
·017901
·
IF 1.7
Siwen You,Ziyi Shao,Xiao Guo,Junjie Jiang,Jinxin Liu,Kai Wang,Mingjun Li,Fangping Ouyang,Chuyun Deng,Fei Song,Jiatao Sun,Han Huang
Hybrid organic–inorganic perovskite thin films have attracted much attention in optoelectronic and information fields because of their intriguing properties. Due to quantum confinement effects, ultrathin films in nm scale usually show special properties. Here, we report on the growth of methylammonium lead iodide (MAPbI3) ultrathin films via co-deposition of PbI2 and CH3NH3I (MAI) on chemical-vapor-deposition-grown monolayer MoS2 as well as the corresponding photoluminescence (PL) properties at different growing stages. Atomic force microscopy and scanning electron microscopy measurements reveal the MoS2 tuned growth of MAPbI3 in a Stranski–Krastanov mode. PL and Kelvin probe force microscopy results confirm that MAPbI3/MoS2 heterostructures have a type-II energy level alignment at the interface. Temperaturedependent PL measurements on layered MAPbI3 (at the initial stage) and on MAPbI3 crystals in averaged size of 500 nm (at the later stage) show rather different temperature dependence as well as the phase transitions from tetragonal to orthorhombic at 120 and 150 K, respectively. Our findings are useful in fabricating MAPbI3/transition-metal dichalcogenide based innovative devices for wider optoelectronic applications.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Zhiyong Yin,Zhibing Zhang,Xili Jing,Linchuan Hu,Shuguang Li,Jianshe Li
Background Surface plasmon resonance (SPR) sensing technology has been widely used in biometrics, but the weak detection capability and low sensitivity limit the development of SPR biosensors. In this work, we propose to employ the transition metal disulfide (TMD) material MoS 2 to induce the SPR effect into the near-infrared band. The aim of this work is to develop a near-infrared sensor capable of quantitatively detecting the concentration of cDNA, which is able to solve the problems of low sensitivity, parameter crosstalk and so on. Results The results show that the sensitivity of the SPR sensor at infrared wavelengths is 1.69 times higher than that of visible, and the infrared wave is more suitable as an excitation source for the SPR effect because it has a stronger evanescent field. In addition, we have prepared a DNA hybridization sensor that can work in the near-infrared band to detect complementary DNA (cDNA) concentration. Moreover, a combined cascade and parallel strategy realized the temperature and PH detection. The sensor uses the photonic crystal fiber as the platform, silver film as an excitation layer, and MoS 2 as a modulation layer. The optimal parameters of the sensor were determined during the experiment, and the three-parameter detection was successfully realized. The experimental results show that the three sensing channels can work independently, and the DNA hybridization probe can achieve selective detection of cDNA with a sensitivity as high as 0.22 nm/(nmol/L). Significance The proposed three-channel DNA hybridization sensor has high sensitivity and accuracy. The innovation of this work is to demonstrate that infrared waves are more suitable to be used as the excitation source of SPR sensors and that the proposed three-channel sensor has a promising future in early diagnosis and biosensing.
研究领域:
生物传感
·
分子生物学
·
光学工程
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 18
·2555-2563
·
IF 4.592
Yafei Wang,Wanhui Liu,Jiyong Deng,Guohua Xie,Yuanwei Liao,Zuoming Qu,Hua Tan,Yu Liu,Weiguo Zhu
Pi-conjugated organic molecules featuring the donor–bridge–acceptor (D–π–A) structure have been widely used in semiconducting materials owing to their rigid structure, good thermal stability, excellent charge transfer, and high emission efficiency. To investigate the effect of the D–π–A molecular structure on the photophysical properties, in this contribution, three star-shaped D–π–A isomers based on the 2,4,6-triphenyl-1,3,5-triazine, spirofluorene, and triphenylamine moieties, that is, p -TFTPA, mp -TFTPA, and m -TFTPA, were synthesized by elaborately engineering the interconnecting position in the building-block units. The optophysical properties of these compounds were systematically explored by experiments and theory calculations. Definitively, changing the interconnecting position in these molecules played a significant role in the degree of π conjugation, which resulted in tunable emission colors from deep blue to green. Moreover, these isomers were employed as emissive dopants in organic light-emitting diodes. The highest external quantum efficiency of 2.3 % and current efficiency of 6.2 cd A −1 were achieved by using the p -TFTPA based device. This research demonstrates a feasible way to realize blue emitters by engineering D–π–A conjugation.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Long Li,Ying Zhu,Feiyu Zhang,Hui Li,Jibran Iqbal,Ting Wu,Yiping Du
In this work, in-syringe membrane solid-phase extraction (MSPE) device was fabricated for the on-site sampling of sulfamethoxazole (SMX) in food samples followed by solid-phase fluorescence spectra analysis. The samples and fluorescamine (FA) were added to a syringe for derivation. Then, the derivative of SMX was extracted by a membrane in the syringe SPE device. Subsequently, the derivative on the membrane was measured immediately without additional elution procedure. The method was successfully applied in plasma, milk, and egg samples for the trace SMX detection, with the recovery of 98%–102%, RSDs from 1% to 6%. Compared with liquid chromatography, direct detection of the concentrated analyte significantly improved the sensitivity. Moreover, fluorescamine made it unnecessary to separate SMX from the interference. Consequently, it was a time-saving, low-cost, and easy-operation method, which demonstrated the potential of in-syringe SPE as a promising candidate for on-site analysis.
研究领域:
分析化学
·
食品安全
·
药物分析
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）