APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ayyakannu Sundaram Ganeshraja,Kaixin Zhu,Kiyoshi Nomura,Junhu Wang
The hierarchical silver chloride loaded tin-doped titania (AgCl@Sn-TiO 2 ) microspheres were first time prepared by a hydrothermal method and annealing at different temperatures. The catalyst showed the enhanced visible light photocatalytic activity as compared to the plasmonic photocatalysts of AgCl and Ag/AgCl, and commercial Degussa P25 (TiO 2 ). The improved efficiency is considered to local surface plasmonic resonance (AgCl could reduce to Ag 0 during photocatalytic reaction) in enhanced broad band visible light absorption in addition to the characteristics of heterojunction between Sn-TiO 2 and AgCl NPs. Moreover, the surface and bulk properties of as-synthesized samples were analyzed by 119 Sn Mössbauer spectroscopy. The magnetic property of the bulk was studied as a function of magnetic field with different temperatures. These results signify the clear details of the magnetic and visible light photocatalytic activities of hierarchical AgCl@Sn-TiO 2 microspheres.
研究领域:
材料科学
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环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 24
·1901335
·
IF 7.125
Guojun Zhou,Mingze Li,Jing Zhao,Maxim S. Molokeev,Zhiguo Xia
With single-component photoinduced white-light (WL) emission, low-dimensional hybrid halide perovskites have emerged as a new generation of luminescent materials; however, the effect of halogens on the intrinsic light emissions and the corresponding mechanisms is still unknown. Herein, the investigation of a family of two-dimensional (2D) hybrid perovskites R 2 PbBr 4− x Cl x ( R = BA + , PMA + , PEA + ; x = 0, 1, 2, 3, 4) highlights the influence of halogens on intrinsic emission to reveal the dependence of the photoluminescence on the nature and contribution of the halogens. Ultrabroad emissions covering the entire visible-light region are achieved in the halogen hybrid systems with the stoichiometry of R 2 PbBr 2 Cl 2 ( R = BA + , PMA + , PEA + ), showing their potential as single-component WL phosphors in solid-state lighting devices. The origin of the WL emissions is the synergistic recombination emission of free excitons and self-trapped excitons. The ratio of halogens (Br/Cl) is confirmed to be a critical factor to fine-tune the intrinsic emission properties. This work provides a feasible strategy to achieve single-component WL emission in 2D hybrid perovskites, and proposes a method for regulating halogen contents for optimizing luminescent properties.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
ACS Biomaterials Science & Engineering
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2020
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IF 4.152
Xiaojun Long,Yang Yi,Xiaozhao Wang,Xiyue Duan,Yuan Sun,Chengwei Wu,Wenjian Weng,Boyong Xu,Kui Cheng,Huiming Wang,Jun Lin
Light-induced cell harvest shows much potential in in vitro cell culture. In this work, a light-responsive monolayer graphene (Gr)/titanium dioxide nanodot (TN) film is designed and used for light-induced cell harvest. It is found that after 20 min of 365 nm UV or 450 nm visible light illumination, different types of cells could be detached from the surface effectively. The highest cell detachment ratio reaches about 95%. The mechanism of such a cell detachment is contributed to light illumination generates charge accumulation, which, in turn, changes the conformation of the extracellular matrix protein molecules adsorbed to a more disordered state, and eventually leads to the cells detachment. Such UV and visible light responsive Gr/TiO2 film could be a good candidate for a surface with light-induced cell detachment property.
研究领域:
生物材料学
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细胞生物学
✓ 已验证
DOI
高影响因子
Journal of Saudi Chemical Society
·
2015
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IF 2.523
Lijie Wang,Xi Zhang,Peng Zhang,Zetan Cao,Junhua Hu
Mn doped TiO 2 was synthesized by hydrothermal treatment of titanium boride and manganese chloride. The doped nano powders were fabricated by adding ammonium water into the mother solution which was obtained hydrothermally. The calcination of precursory powders took place at the temperature of 400–600 °C which resulted in the formation of anatase with a small amount of rutile phase. The shift of valence band maximum (VBM) toward the lower binding energies was observed by measuring the position of VBM with reference to the Fermi level, which contributed to the significant red-shift of absorption edges. X-ray photoelectron spectroscopy (XPS) measurement shows that manganese exists in both 4+ and 3+ valance states, which may have a temperate replacing of Ti 4+ because of the charge compensation compared with 2+ and 3+ valence states. The property of photoelectric conversion was detected by evaluating the photocurrent under visible light (>420 nm), and the fluorescence spectra also proved that 6%-Mn doped TiO 2 (DM6) shows a better photoelectric conversion performance.
研究领域:
材料科学
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光催化
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
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2021
·Vol. 50
·期 28
·9804-9811
·
IF 4.39
Zexin Li,Fenglei Sun,Haining Song,Haifeng Zhou,Yifei zhou,Zhenlei Yuan,Peng Guo,Guangjun Zhou,Qianqian Zhuang,Xiaoqiang Yu
Lead-free double perovskite has attracted widespread attention due to its good stability and non-toxicity. In this work, Cs2AgxNa1−xInCl6 quantum dots were synthesized via a thermal injection method using non-toxic precursors. Based on the wide spectrum of self-bound excitons, the quantum dots achieved white light emission. Bi-doped Cs2AgxNa1−xInCl6 quantum dots with excellent luminescence performance have the same cubic structure, and they have a larger Stokes shift. The cubic perovskite space group is Fmm, and [NaCl6], [AgCl6] and [InCl6] octahedrons alternately appear in the cubic structure. The photoluminescence quantum yield of Cs2AgxNa1−xInCl6 is improved by doping with a small amount of Bi; the PL QY increased to 57.3% with an obvious emission peak at 600 nm. The stability and luminescence intensity of perovskite QDs were further enhanced by SiO2 coating and a Cs2AgxNa1−xInCl6:Bi-SiO2 thin film was prepared using perhydropolysilazane as the precursor. The materials have huge application potential in the field of white light emission and display.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2023
·
IF 3.6
Yi Fang,Chunyi Liu,Jie Tang,Zheng Pei,Zhengping Chen
A photocatalytic synthesis of difluoromethylated selenides from selenosulfonates is described here. Bench-stable difluoromethyl phosphonium salt [Ph3PCF2H]Br reacts smoothly with selenosulfonates to give a series of functionalized difluoromethylated selenides in moderate to good yields via a radical process. This protocol is free of a stoichiometric base and reductant, has tolerance of functional groups, and has successful late-stage modification of bioactive molecules, which provides facile access to molecules of pharmaceutical relevance.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Liang Ren,Jianxin Chen,Qing Lu,Jian Han,Hong Wu
Membrane fouling, caused by aggregation of organics and microorganisms from filtrate on the membrane surface, seriously reduces the service life of a nanofiltration (NF) membrane. Developing facile and renewable antifouling modification methods without sacrificing separation properties of the membrane remain an imperative requirement. Herein, a thin-film composite (TFC) NF membrane with a light-responsive and regenerable functional layer (P-TFC) was fabricated via host–guest interactions between the azobenzene (guest) labeled functional polymers and the β-cyclodextrin (host) bonded membrane surface (H-TFC). The P-TFC-3 not only showed outstanding antifouling ability and high flux recovery ratio (FRR > 90% at the fourth antiadhesive test) but also exhibited enhanced water permeability (17.9 L m–2 h–1 bar–1) and high selectivity (αMgSO4NaCl = 33.4 and fast antibiotics enrichment capacity) compared with the pristine membrane. Furthermore, when the functional layer was contaminated, it can be removed by ultraviolet light irradiation and a new functional layer can be rebuilt by adding fresh azobenzene labeled functional polymers. After several regeneration processes, the membranes still showed constant separation properties and high flux recovery ability (FRR > 90%). This work proposes an easy-to-assemble and regenerable surface modification strategy to endow TFC NF membranes with excellent fouling resistance and sustainable utilization ability while maintaining high separation properties.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·996-1002
·
IF 8.897
Ha Enna,Ruan Shuhong,Li Danyang,Zhu Yuanmin,Chen Yanping,Qiu Jiangyuan,Chen Zhaohui,Xu Tingting,Su Jingyun,Wang Luyang,Hu Junqing
Metal chalcogenide solid solution, especially ZnCdS, has been intensively investigated in photocatalytic H 2 generation due to their cost-effective synthetic procedure and adjustable band structures. In this work, we report on the defect engineering of ZnCdS with surface disorder layer by simple room temperature Li-ethylenediamine (Li-EDA) treatment. Experimental results confirm the formation of unusual Zn and S dual vacancies, where rich S vacancies (V S ) served as electron trapping sites, meanwhile Zn vacancies (V Zn ) served as hole trapping sites. The refined structure significantly facilitates the photo charge carrier transfer and improves photocatalytic properties of ZnCdS. The disordered ZnCdS shows a highest photocatalytic H 2 production rate of 33.6 mmol·g −1 ·h −1 under visible light with superior photocatalytic stabilities, which is 7.3 times higher than pristine ZnCdS and 7 times of Pt (1 wt.%) loaded ZnCdS.
研究领域:
材料科学
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化学
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光催化
·
可再生能源
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Hong Liu,Jean Paul Nkundabose,Houwang Chen,Liuliu Yang,Chen Meng,Ning Ding
Heterogeneous photocatalysis has caught attention in scientific community as an alternative and sustainable approach for environmental remediation. With that said, it is still a challenge to find affordable, photostable, harmless and chemically inert catalysts. In the present study, a novel visible light-responsive hybrid photocatalyst (AgBr/PSGCN-100) was synthesized via in-situ deposition precipitation that combines the phosphorus and sulfur co-doped graphitic carbon nitride (PSGCN) and AgBr particles. The as-synthesized samples were successfully characterized by various techniques including XRD, FT-IR, SEM, TEM , XPS, UV–vis DRS and PL . Compared to the other as-prepared samples and single photocatalysts, AgBr/PSGCN-100 performed well in terms of IBF photodegradation . Using 0.1 g AgBr/PSGCN-100, 0.5 mg/l, 1 mg/l, and 5 mg/l of IBF were completely degraded just in 20, 30, and less than 60 min of visible light irradiation, respectively; whereas 90% efficiency was achieved with increased IBF concentration (15 mg/L) in 100 min. As per trapping scavenger studies, the holes (h + ) and superoxide radicals (•O 2 − ) were the predominant reactive oxygen species for IBF degradation. However, hydroxyl radicals (•OH) also played a significant role. The good photocatalytic performance of AgBr/PSGCN-100 was linked to its heterostructure form. IBF intermediate products were analyzed by LC/MS-MS used negative electrospray ionization mode (ESI). We believe this study to be insightful in the rational design and best conception of heterostructure photocatalysts for environmental applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ANALYST
·
2019
·Vol. 145
·期 2
·424-433
·
IF 4.019
Zhen Lin,Shu Luo,Dafen Xu,Shijun Liu,Namei Wu,Wensong Yao,Xiaomin Zhang,Linlin Zheng,Xinhua Lin
In this study, silica-polydopamine hybrids (SPDA) were fabricated by a facile and one-step heating method using dopamine and (3-aminopropyl)triethoxysilane (APTES) as the reaction reagents. It was firstly found that light illuminated-SPDA could oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue ox-TMB. The coloration process was quenched very efficiently via the addition of Cu2+. The presence of pyrophosphate ion (PPi) in the solution of light-illuminated SPDA-Cu2+-TMB induced the recovery of the coloration process. The recovery occurred because PPi coordinated with Cu2+, effectively sequestering the ion from SPDA. A calibration curve was developed that is related to the extent of absorption recovery to [PPi], making the SPDA-Cu2+-TMB system a sensitive and selective turn-on sensor for PPi detection. The limit-of-detection (LOD) for PPi was 0.06 μmol L−1 (S/N = 3) with a linear dynamic range of 0.1–30 μmol L−1 and the calibration curve of linear equation is given as: y = 0.00146x + 0.05096 (r = 0.9974). The proposed method has been successfully applied to the detection of PPi in human serum with satisfactory recovery. The simplicity, low cost, high sensitivity, good reproducibility and excellent selectivity of the PPi detection platform based on the light-induced oxidase mimicking property of SPDA makes it promising for further applications of SPDA in chemo/biosensing.
研究领域:
分析化学
·
生物传感
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 42
·27189-27198
·
IF 4.036
Jing Wan,Aseel Shaker Al-Baldawy,Shanzhi Qu,Jinshen Lan,Xiaofang Ye,Yuchen Fei,Jingtian Zhao,Ziyun Wang,Rongdun Hong,Shengshi Guo,Shengli Huang,Shuping Li,Junyong Kang
A ternary semiconductor ZnO/MoS2/Ag2S nanorod array in an intimate core–shell structure was synthesized on glass substrates. The physicochemical properties and photocatalytical performance of the specimen were characterized and compared with single ZnO and binary ZnO/Ag2S and ZnO/MoS2 nanorod arrays. It is found that the coating layers depressed the band edge emission of the ZnO core, improved light absorption in the visible range, reduced charge transfer resistance, and increased photocatalytic activity. The ternary heterojunction nanorod array possessed full solar absorption with an efficiency of 52.88% for the degradation of methylene blue under visible light in 30 min. The efficiency was higher than other arrays and was 7.6 times that of the ZnO array. Theory analysis revealed that the coating layer brought different band alignment in the heterojunctions for efficient charge separation and conduction, which was beneficial for the photocatalytic performance.
研究领域:
材料科学
·
光催化
·
半导体物理
✓ 已验证
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 12
·1925-1936
·
IF 4.5
Ma Jianzhong,Wen Lu,Fan Qianqian,Wei Siying,Hu Xueyun,Yang Fan
In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO 2 in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs 2 AgBiBr 6 double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO 2 /Cs 2 AgBiBr 6 composite, which was identified as an S-cheme heterojunction. TiO 2 /Cs 2 AgBiBr 6 composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO 2 could be boosted to 0.1369 min −1 . This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO 2 /Cs 2 AgBiBr 6 composites, which will facilitate the generation of new ideas for improving TiO 2 ’s photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）