JOURNAL OF NANOPARTICLE RESEARCH
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2022
·Vol. 24
·期 12
·1-14
·
IF 2.533
Ma C. Y.,Wang R. T.,Zhao G. H.,Zhang Q. Y.
The construction of matchable multi-heterojunction with appropriate morphology provides a good strategy for improving the performance of semiconductor photocatalyst in degrading organic pollutants. Herein, binary WO 3 /Bi 2 WO 6 nanosheets coupled with various contents of mesoporous anatase TiO 2 nanoparticles for constructing TiO 2 /WO 3 /Bi 2 WO 6 heterojunction composite photocatalysts are hydrothermally fabricated. The investigation on structure and properties in the TiO 2 /WO 3 /Bi 2 WO 6 ternary photocatalysts in terms of the incorporation of TiO 2 is systematically conducted by using characterization techniques. The results show that the TiO 2 /WO 3 /Bi 2 WO 6 ternary composite at the optimized Ti/W ratio of 1:2 has the highest visible light-irradiated MB degradation, which is 9.5 times and 2.8 times that of pure TiO 2 and pristine WO 3 /Bi 2 WO 6 nanosheets, respectively. The effective charge separation between TiO 2 and WO 3 /Bi 2 WO 6 has been confirmed by PL and current–voltage (I-V) characteristics. A possible mechanism is clarified through the active species trapping experiments using various scavengers, indicating that photogenerated holes and • OH radicals play a key role. The enhanced photocatalytic activity can be ascribed to the synergistic effect of the unique structure with some favorable properties, including the elevation of the separation efficiency of photoinduced electron–hole pairs at the multi-heterojunction interfaces with appropriate band structures as well as more active adsorption sites of mesoporous/nanosheet microstructure in the degradation process. This research may provide a simple method for design and preparation of novel heterojunction photocatalysts for enhanced visible light-driven photocatalytic activity. Graphical Abstract
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Materials Today Physics
·
2023
·
IF 11.5
Rahul A. Rajan,Huang Tao,Weili Yu,Jianjun Yang
Femtosecond laser processing of lead halide perovskites has recently sparked wide popularity for creating various micro/nanostructures and instigating interesting properties. However, it is still lacking detailed insights into correlating the laser induced morphology and defect chemistry of perovskite materials to their light emitting properties. Here, the space-resolved photoluminescence and lasing behaviors are investigated for both the single crystal (SC) and polycrystalline (PC) perovskites upon femtosecond laser ablation . In the case of SC sample, three different regions based on the laser ablation , recast deposition, and modification respectively exhibits distinguished carrier recombination mechanisms due to their variable defect chemistries and morphologies identified, which helps to realize the amplified spontaneous emission with the recrystallized micro/nanostructures. On the other hand, the laser modified region on the PC sample reveals the significant enhancement of random lasing performance (the lasing threshold was reduced by ∼7 times and the slope efficiency increased by ∼1.5 times), which is attributed to the femtosecond laser induced non-radiative defect passivation and the average crystalline grain size reduction by more than 1.5 times. This study unveils the physical and chemical modification effects of the femtosecond laser irradiation on perovskite materials, and thus is an optimal strategy to fabricate desired perovskite light-emitting microstructures by ultrafast laser processing.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xuejiao Feng,Huishan Shang,Jinling Zhou,Xuke Ma,Xiangyang Gao,Dan Wang,Bing Zhang,Yafei Zhao
Rational constructing hierarchical core–shell structured photocatalysts to accelerate the separation and transfer of light-induced electrons is extraordinarily indispensable to boost the performance of photocatalytic hydrogen evolution. Herein, we integrate two-dimensional (2D) ZnIn 2 S 4 (ZIS) nanosheets and flower-like CoS 1.097 assembled with one-dimensional (1D) nanothorns to construct hierarchical 1D/2D CoS 1.097 @ZIS with ZIS nanosheets and CoS 1.097 nanothorns as shell and core respectively as an effective visible light photocatalyst to produce hydrogen from water splitting. The optimized 8.5-CoS 1.097 @ZIS photocatalyst demonstrates an outstanding activity with hydrogen production rate of 2632.33 µmol g −1 h −1 (6.42 times of ZIS alone) and good stability for photocatalytic water splitting. The enhanced performance can be ascribed to the distinctive structure and composition of CoS 1.097 @ZIS, which affords intimate contact interface, strong light absorption and abundant reaction sites, thus facilitating the separation and transfer of the charge carriers as well as inhibiting charge recombination. This work offers a prospective approach to construct 1D/2D core–shell ZIS-based photocatalysts for hydrogen production from water splitting.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Mengnan Nie,Chao Zhou,Weiwei Feng,Changhui Xin,Xin Yu,Qian Li
Self-doped Ti 3+ -TiO 2 and amorphous ZnS layers-coated Ti 3+ -TiO 2 nanostructures were successfully fabricated for via a calcination-ultrasonic synthesis strategy for organic pollutant degradation under visible-light illumination. The experimental results revealed that the synthesized Ti 3+ -TiO 2 clusters displayed efficient visible-light absorption and photocatalytic performance. It was also found that amorphous ZnS layers were formed on the coral-like Ti 3+ -TiO 2 clusters via an ultrasonic synthesis method, and the strongly combined interfaces greatly boosted the charge separation between ZnS layers and self-doped Ti 3+ -TiO 2 clusters. The synthesized Ti 3+ -TiO 2 @ZnS-15% heterojunction presented the highest photocatalytic activity with a rate constant of 0.03197 min −1 , approximately 9.87 times of commercial TiO 2 . In addition, the prepared Ti 3+ -TiO 2 @ZnS composites also exhibited highly boosted photocatalytic performance towards ciprofloxacin and tetracycline degradation under visible-light illumination compared with those of commercial TiO 2 , Ti 3+ -TiO 2 , and ZnS samples. Finally, the norfloxacin degradation pathways and visible-light photocatalytic mechanism over nanostructured Ti 3+ -TiO 2 @ZnS heterojunctions were suggested.
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Micromachines
·
2022
·Vol. 14
·期 1
·11
·
IF 3.523
Weigao Wang,Yiyang Li,Yu Duan,Mingxia Qiu,Hua An,Zhengchun Peng
Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is widely used in optoelectronic devices due to its excellent hole current conductivity and suitable work function. However, imbalanced carrier injection in the PEDOT:PSS layer impedes obtaining high-performance perovskite light-emitting diodes (PeLEDs). In this work, a novel poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,40-(N-(p-butylphenyl))diphenylamine)] (TFB) is applied as the hole transport layers (HTLs) to facilitate the hole injection with cascade-like energy alignment between PEDOT:PSS and methylammonium lead tribromide (MAPbBr3) film. Our results indicate that the introduced TFB layer did not affect the surface morphology or lead to any additional surface defects of the perovskite film. Consequently, the optimal PeLEDs with TFB HTLs show a maximum current efficiency and external quantum efficiency (EQE) of 21.26 cd A−1and 6.68%, respectively. Such EQE is 2.5 times higher than that of the control devices without TFB layers. This work provides a facile and robust route to optimize the device structure and improve the performance of PeLEDs.Keywords:lead halide perovskites;perovskite light-emitting diodes;hole transport layers;interface modification
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PubMed
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Hua Wu,Ling Yang,Lihong Chen,Huibin Wang,Bin Yu,Xue Lu,Jianxin Xia,Junfeng Geng,Hua Li
Developing highly performance TiO 2 -based photocatalyst for pollutant removal from environmental media is of increasing interest from both research and practical perspectives. However, there are currently few developed materials effective for fully addressing all limitations in the catalytic performance and real application. Herein, we report the fabrication of triple-functional {0 0 1}-N-TiO 2 /VSCF/Fe 3 O 4 through a one-step hydrothermal-template synthesis coupled with composite methods as an effective material towards resolving most of the dilemmas. The resultant composite incorporated efficient pollutant capture and photocatalytic degradation, material recovery into one individual, which consists of a hollow-spherical {0 0 1}-N-TiO 2 photocatalytic site, a vine-shaped carbon fiber adsorptive loader and a Fe 3 O 4 magnetic-responsive part. When exposed to the pollutant under light irradiation, the {0 0 1}-N-TiO 2 /VSCF composite showed remarkable photocatalytic performance. The magnetic-responsive property of {0 0 1}-N-TiO 2 /VSCF/Fe 3 O 4 facilitated catalyst recovery, the composite exhibited good catalytic stability during recycling uses. Our triple composite {0 0 1}-N-TiO 2 /VSCF/Fe 3 O 4 may be applied as a comprehensive functional, efficient and recyclable material for eliminating the current problems in environmental remediation and purification.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 11
·2367-2376
·
IF 7
Lizhi Jiao,Qisi Li,Chenming Li,Jinhui Gu,Xinping Liu,Shuijian He,Zhijun Zhang
Efficient and spatiotemporally controllable cleavage of deoxyribonucleic acid (DNA) is of great significance for both disease treatment (e.g. tumour, bacterial infection, etc) and molecular biology applications (e.g. gene editing). The recently developed light-induced cleavage strategy based on catalytic nanoparticles has been regarded as a promising strategy for DNA controllable cleavage. Although the regulation based on orthogonal light in biomedical applications holds more significant advantages than that based on single light, nanoparticle-mediated DNA cleavage based on orthogonal light has yet to be reported. In this article, for the first time, we demonstrated an orthogonal light-regulated nanosystem for efficient and spatiotemporal DNA cleavage. In this strategy, tungsten oxide (WO3) nanoparticles with photochromic properties were used as nano-antennae to convert the photoenergy from the orthogonal visible light (405 nm) and near-infrared light (808 nm) into chemical energy for DNA cleavage. We verified that only the orthogonal light can trigger high cleavage efficiency on different types of DNA. Moreover, such an orthogonal light-response nano-system can not only induce significant apoptosis of tumour cells, but also effectively eliminate bacterial biofilms.
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Materials Today Sustainability
·
2022
·
IF 7.244
S. Wei,S. Fan,M. Zhang,J. Ren,B. Jia,Y. Wang,R. Wu,Z. Fang,Q. Liang
Different from traditional dye sensitization by chemisorption in the dark, this work uses electron trapping sites and positively charged rhodamine B dye molecules to achieve electrostatic interaction under irradiation. As the irradiation time increases, the surface oxygen vacancies of Bi 2 MoO 6 as the electron trapping sites gather a large number of electrons forming negative surface, which are tightly bound to the positive rhodamine B dye molecules. In the dye-sensitized Bi 2 MoO 6 system, the electrons located on the oxygen vacancies can reduce the oxidized dyes to ground state. The newly formed ground-state dyes are photoexcited again and inject electrons into the conduction band of the Bi 2 MoO 6 to participate in photodegradation levofloxacin. Then the newly aggregated electrons on the oxygen vacancies repeat the above cycle. The formation of the cyclic path greatly reduces the recombination of electrons and holes in Bi 2 MoO 6 , which increases the efficiency of photocatalytic degradation of levofloxacin from ∼43.5% to ∼98.3% under LED irradiation for 2 h. In addition, the photodegradation pathway of levofloxacin is investigated.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Jiahao Zhang,Shengyu Bai,Zhongqi Li,Guanyao Gu,Hucheng Wang,Lai Wei,Xun Sun,Fuzhen Xuan,Xuhong Guo,Yiming Wang
Poly( N -isopropylacrylamide) (PNIPAm) is widely used for smart materials and devices owing to its thermoresponsiveness. Here we demonstrate how PNIPAm can be geared to show reversible phase transition in response to light rather than temperature through a simple signal transformation strategy. This strategy does not require the polymer to be tediously modified with any photoresponsive moieties, offering a new approach towards remote-controlled smart objects. Our concept is achieved using a photoacid and simple PNIPAm-based copolymers. Upon switching on/off light, the photoacid releases/captures a chemical signal which can reversibly change the lower critical solution temperature (LCST) of the copolymers, thereby resulting in a fast (<0.5 min) and reversible phase transition of the copolymer without changing the ambient temperature. Thereon, a series of light-controlled dynamic patterns and conceptually smart soft actuators composed of the copolymers are fabricated. Such a signal transformation strategy enabling PNIPAm photoresponsiveness may boost the development of new non-contact smart objects with adaptive responsiveness.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 4
·1128-1139
·
IF 5
Peijing Guo,Shaoyu Yuan,Bingrong Guo,Siwei Li,Yongjun Gao
A CoO–CdS heterostructured photocatalyst CC-2-300 loaded with carbon derived from the biomass material chitosan was synthesized. Under visible-light irradiation, the photocatalytic hydrogen evolution rate can reach up to 10.60 mmol gcat−1 h−1, which is 7.21 times higher than that of pure CdS under the same conditions, with good cycle stability and high apparent quantum efficiency. The control experiments and characterization results prove that the chitosan-derived carbon supported CoO nanorods and CdS nanoparticles are cross-distributed to form a direct Z-scheme heterojunction, which improves the migration efficiency of photogenerated carriers and effectively slows down the recombination rate of photogenerated charges and holes on CdS that is susceptible to photocorrosion, thus improving the efficiency of photocatalytic hydrogen evolution.
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JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Jinyan Du,Na Xu,Pingchuan Yuan,Qin Shu,Chaofeng Wang,Qidi Xu,Ping Zhang,Shujuan Zhuo,Changqing Zhu
Using ammonium chloride (NH 4 Cl) as a gas template, we conveniently fabricated ultrathin two-dimensional layered silver-embedded graphitic carbon nitride nanosheets (AgCNS) by melamine blowing method with triazine groups of pristine graphite carbon nitride. Compared with bulk g-C 3 N 4 (BCN) and g-C 3 N 4 nanosheets (CNS), the antibacterial activity of the optimized AgCNS-5 at a minimum inhibitory concentration (MIC) of 40 ppm against Escherichia coli ( E. coli ) was significantly enhanced. Under visible-light irradiation, E. coli could be completely killed by 100 µg·mL −1 of AgCNS-5 within 30 min. The mechanism of enhanced antibacterial activity was systematically investigated by ultraviolet-visible diffuse reflectance spectra (UV-vis DRS), photoluminescence spectra (PL), electrochemical impedance spectroscopy (EIS), and photogenerated current densities. Surface plasmonic resonance (SPR) of Ag nanoparticles (NPs) with g-C 3 N 4 was found to lead to an enhancement of visible light absorption and an acceleration of photo-induced electron-hole migration/separation, which is responsible for the enhanced photocatalytic bactericidal performance. Through trapping experiments and electron spin resonance spectroscopy (ESR) techniques, the bactericidal mechanism was revealed that the species of •O 2 − and •OH play important roles in antibacterial process. Considering the facile preparation and excellent performance, AgCNS-5 may be a promising and competitive visible-light-driven candidate toward sterilizing agent.
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ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Songman Ju,Chaomin Mao,Yang Liu,Yangbin Zhu,Zhongwei Xu,Kaiyu Yang,Tailiang Guo,Hailong Hu,Fushan Li
Perovskite quantum dots light-emitting diodes (PQLEDs), due to the advantages of high luminous efficiency, high color purity, adjustable spectral range, etc., has an excellent prospect in the next generation of high-definition displays. As an indispensable part of displays, blue PQLEDs are usually achieved by mixing halogen, which, however, will lead to halogen ion migration and phase separation of perovskite material at high temperature and bias pressure, thus make the electroluminescent spectrum redshift. In this manuscript, we propose a strategy to inhibit phase separation of blue perovskite quantum dots (PQDs) by introducing alkali metal , and obtain stable perovskite quantum dot light-emitting diodes. The PQLEDs based on this strategy show an external quantum efficiency (EQE) of 1.87% and a brightness of 3757 cd m −2 , and can still guarantee stable electroluminescence (EL) spectra at a bias of up to 14 V. The work is beneficial for probing into the mechanism of suppressing the phase separation of mixed halogen blue PQDs and offer a promising strategy to enhance the color stability of blue PQLEDs.
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