ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Wenxu Yin,Xue Bai,Ping Chen,Xiaoyu Zhang,Liang Su,Changyin Ji,Haoming Gao,Hongwei Song,William W. Yu
Transition-metal dichalcogenides like tungsten disulfide (WS2) are luminescent but still bear low quantum yields and hardly meet the requirement of practical applications. Here, we developed a hot-injection method to prepare highly luminescent WS2 quantum dots with tunable particle size in a noncoordinating solvent, some that are even smaller than its Bohr radius. The as-synthesized WS2 quantum dots exhibit a narrow size distribution and a high photoluminescence quantum yield of 32%, the highest record compared to the known reports. The WS2 quantum dot layer was employed to fabricate white light-emitting diodes with a maximum brightness of 507 cd/m2, adjustable color temperatures from 4100 to 10 000 K, and excellent color rendering index of 91. These results confirm the promising optoelectronic applications of WS2 quantum dots.
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高影响因子
APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Yaju Zhou,Jinze Li,Chongyang Liu,Pengwei Huo,Huiqin Wang
A multiple transmission channels, heterojunction and 3D PCN/AgBr/rGO photocatalyst was successfully synthetized by introducing the reduced graphene oxide (rGO) covering AgBr onto the surface of 3D porous g-C 3 N 4 (PCN). In PCN/AgBr/rGO, PCN as a semiconductor photocatalyst provides the 3D framework, the heterojunction was formed with AgBr particles and PCN, rGO promotes the electron transfer simultaneously and introduces a multiple transmission channels system to increase the active species. Thanks to the heterojunction formed between PCN and AgBr, resulting rapid separation of photo-generated e − /h + at interface. The 3D PCN/AgBr/rGO nanocomposite exhibits excellent photocatalytic efficiencies for tetracycline (TC) up to 78.4% within 90 min and 2,4-dichlorophenol (2,4-DCP) up to 68.2% within 6 h. The photocatalytic rate of PCN/AgBr/rGO was much higher than 3D PCN (21%), AgBr particles (31%) and most of g-C 3 N 4 -based photocatalysts in TC degradation. Moreover, the PCN/AgBr/rGO shows high photocatalytic stability due to the significantly photocatalytic stability after four photo-degradation cycles. This study highlights the potential application of PCN/AgBr/rGO highly efficient waste water purification.
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JOURNAL OF CONTROLLED RELEASE
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2018
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IF 7.877
Hao-Ran Jia,Ya-Xuan Zhu,Ke-Fei Xu,Xiaoyang Liu,Fu-Gen Wu
The past decade has witnessed a growing number of nanoparticulate drug delivery systems for cancer treatment. However, insufficient cellular uptake by cancer cells and the undesirable endo/lysosomal entrapment of internalized therapeutic drugs remain the “Achilles heel” of many developed nanoagents. Here, we develop a novel lipid raft-responsive and light-controllable polymeric drug for efficient cytosolic delivery of photosensitizers . Conjugating a photosensitizer protoporphyrin IX (PpIX) to a polyethylene glycol-cholesterol polymer affords the amphiphilic drug (denoted as Chol−PEG−PpIX) that forms micelles in aqueous solutions. The Chol−PEG−PpIX with two hydrophobic units (cholesterol and PpIX) showed robust binding to plasma membranes and enabled significant cellular uptake via two pathways: (1) cholesterol moiety triggered the lipid raft-mediated endocytosis of Chol−PEG−PpIX with minimized endo/lysosomal trafficking after internalization; (2) the membrane-bound PpIX acted as a light-controlled trigger and can augment the permeability of plasma membranes upon laser irradiation, allowing the rapid influx of extracellular Chol−PEG−PpIX within 5 min. For systemic drug delivery, Chol−PEG−PpIX was anchored on the surface of liposomes via in situ membrane modification, which substantially avoided nonspecific binding of Chol−PEG−PpIX to red blood cells during circulation. Besides, the Chol−PEG−PpIX-anchored liposomes exhibited enhanced in vivo fluorescence , reduced liver uptake, prolonged tumor retention, and effective tumor ablation by photodynamic therapy . This work illustrates a new strategy for direct and efficient cytosolic delivery of photosensitizers, which may hold great promise in cancer therapy.
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高影响因子
SYNTHETIC METALS
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2018
·
IF 2.526
Chengqiang Ding,Ziqian Li,Wensheng Tan,Hongda Li,Jianfeng Ma,Zhongping Chen,Yongxin Tao,Yong Qin,Yong Kong
A novel ultraviolet (UV)- and visible-light-active 3D graphene aerogels (3DGA)/Sb 2 WO 6 hybrid photocatalyst was prepared by electrostatic self-assembly (ESSA) method. The photocatalytic activity of the 3DGA/Sb 2 WO 6 hybrid was studied by monitoring the change in the concentration of methyl orange (MO) under UV-light and visible-light irradiation. The results demonstrated that the as-prepared hybrid exhibited significantly enhanced efficiency for the photodegradation of MO in comparison with pure Sb 2 WO 6 . This was ascribed to the efficient separation of the photogenerated electrons (e–) and holes (h + ) with the aid of 3DGA as well as the generated reactive superoxide radical anions (O 2 •–). Moreover, the 3DGA/Sb 2 WO 6 hybrid exhibited high recyclability, because the highly hydrophobic 3DGA in the hybrid was very advantageous to the separation of the hybrid photocatalyst from the MO solutions.
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RSC Advances
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2019
·Vol. 9
·期 41
·23545-23553
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IF 3.049
Jianhui Li,Fan Yang,Quan Zhou,Lijie Wu,Wenying Li,Ruipeng Ren,Yongkang Lv
The ternary magnetic Fe3O4/BiOBr/BiOI (x : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method. The samples were characterized by XRD, SEM, EDS, ICP-AES, XPS, UV-vis DRS, PL and VSM. Nitrogen-containing dye RhB was used as a degradation substrate to evaluate the photocatalytic degradation activities of the samples. The photocatalytic performance of Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) is superior to other Fe3O4/BiOBr/BiOI (x : 3 : 1). Compared with binary magnetic Fe3O4/BiOBr (0.5 : 1) prepared in our previous work, the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) has obvious advantages in photocatalytic activity and adsorption capacity. And the specific surface area (48.30 m2 g−1) is much larger than that of the previous report (Fe3O4/BiOBr/BiOI (0.5 : 2 : 2)) synthesized by a co-precipitation method. Besides, after 25 s of magnetic field, Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) can be rapidly separated from water. After eight recycling cycles, the magnetic properties, photocatalytic activity, crystallization and morphology of the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) catalyst remain good. The possible photocatalytic degradation mechanism of RhB under Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) photocatalyst was also proposed. The results indicate that the ternary magnetic Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) composite with high photocatalytic degradation efficiency, good magnetic separation performance and excellent recyclability and stability has potential application prospect in wastewater.
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KEY ENGINEERING MATERIALS
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2019
·
IF 0
Fu Chang Peng,Qi Lai,Can Yu Zhong,Yan Cui,Xian Jie Liao,Qiao Chu Liu,Chuan Hai Xiao
The TiO2 nanoparticles with different Yb doping amount were prepared by a facile sol-gel method. The samples were characterized by XRD, TEM, XPS, UV-Vis, and PL, etc. The influence of Yb-doping on structure and visible light photocatalytic activity of mixed phase TiO2 was evaluated by photocatalytic degradation of methylene blue (MB) under the irradiation of fluorescent lamp. The results show that ytterbium appeared two kinds of Yb3+ and Yb2+ valence state on the surface of TiO2. Ytterbium doping can restrain the phase transfer from anatase to rutile, prevent the grain growth, and increase the surface hydroxyl content. Appropriate amount of Yb doping and the proportions of rutile and anatase mixed phase can effectively inhibit the recombination of photogenerated electron and hole, expand the wavelength range of absorption spectrum, and improve the photocatalytic performance of TiO2. Meanwhile, the photocatalytic activity of the Yb-TiO2 samples was the best under the irradiation of fluorescent light when the sintered temperature T=500°C and n(Yb):n(Ti)=0.009, it was 95.2% within 6 h and significantly higher than 56.4% of pure TiO2 under the same experimental conditions.
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CERAMICS INTERNATIONAL
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2019
·
IF 3.45
Haifen Xu,Zichen Xu,Jin Zhou,Ge Yan,Xiaowei Li,Shuping Zhuo
Novel magnetically separable BiOBr/magnetic reduced graphene oxide (BiOBr/MRGO) composite photocatalysts were fabricated using a one-step hydrothermal treatment . The photodegradation of RhB was choose as model reaction to evaluate the photocatalytic performance of as-prepared BiOBr/MRGO composites under visible light. The research results indicated that photocatalytic activities of all BiOBr/MRGO composites were markedly improved, compared to the single BiOBr. Among them, the BiOBr/MRGO hybrids with a MRGO mass ratio of 10% presented the highest photodegradation ability, and the kinetic constant of degradation was about 2 times higher than that of BiOBr. The enhancement of catalytic property was assigned to the increase of visible light absorption and the hindrance of photogenerated electron-hole pairs recombination originating from the introduction of MRGO. More importantly, BiOBr/MRGO exhibited excellent cycling stability after four cycles and could be easily separated by an external magnet and reused, which was convenient to the purification of organic pollutants.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Yang Liu,Chao-Fan Li,Xiao-Yun Li,Wen-Bei Yu,Wen-Da Dong,Heng Zhao,Zhi-Yi Hu,Zhao Deng,Chao Wang,Si-Jia Wu,Hao Chen,Jing Liu,Zhao Wang,Li-Hua Chen,Yu Li,Bao-Lian Su
Photocatalytic hydrogen (H 2 ) production based on semiconductors is important to utilize solar light for clean energy and environment. Herein, we report a visible light responsive heterostructure, designed and constructed by molybdenum disulfide quantum dots (MoS 2 -QDs) in-situ seeds-directing growth and self-assemble of zinc indium sulfide (ZnIn 2 S 4 ) nanosheet to ensure their full contact through a simple one-step solvothermal method for highly improved visible light H 2 production. The MoS 2 -QDs in-situ seeds-directing ZnIn 2 S 4 heterostructure not only builds heterojunctions between MoS 2 and ZnIn 2 S 4 to spatially separate the photogenerated electrons and holes, but also serves as the active sites trapping photogenerated electrons to facilitate H 2 evolution. As a result, MoS 2 -QDs/ZnIn 2 S 4 exhibits high photocatalytic activity for H 2 production, and the optimized 2 wt% MoS 2 -QDs/ZnIn 2 S 4 (2MoS 2 -QDs/ZnIn 2 S 4 ) heterostructure exhibits the highest H 2 evolution rate of 7152 umol·h −1 ·g −1 under visible light, ∼9 times of pure ZnIn 2 S 4 . Our strategy here could shed some lights on developing noble-metal free heterostructures for highly efficient photocatalytic H 2 production.
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RSC Advances
·
2018
·Vol. 8
·期 65
·37200-37207
·
IF 2.936
Enhui Jiang,Xiaoteng Liu,Huinan Che,Chunbo Liu,Hongjun Dong,Guangbo Che
In this study, a novel Ag/Bi3O4Cl photocatalyst has been synthesized by a facile photodeposition process. Its photocatalytic performance was evaluated from the degradation of tetracycline (TC) under visible light irradiation (λ > 420 nm). The 1.0 wt% Ag/Bi3O4Cl photocatalyst could significantly enhance the degradation of TC compared with pure Bi3O4Cl, with the degradation level reaching 94.2% in 120 minutes. The enhancement of photocatalytic activity could be attributed to the synergetic effect of the photogenerated electrons (e−) of Bi3O4Cl and the surface plasmon resonance (SPR) caused by Ag nanoparticles, which could improve the absorption capacity of visible light and facilitate the separation of photogenerated electron–hole pairs. In addition, electron spin resonance (ESR) analysis and trapping experiments demonstrated that the superoxide radicals (˙O2−), hydroxyl radicals (˙OH) and holes (h+) played crucial roles in the photocatalytic process of TC degradation. The present work provides a promising approach for the development of highly efficient photocatalysts to address current environmental pollution, energy issues and other related areas.
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JOURNAL OF CONTROLLED RELEASE
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2018
·
IF 7.877
Meng Wang,Jiahe Wu,Ying Li,Fangyuan Li,Xi Hu,Gang Wang,Min Han,Daishun Ling,Jianqing Gao
Stimuli-responsive nanomaterials have emerged as promising drug delivery systems for tumor therapy, as they can specifically respond to tumor-associated stimuli and release the loaded drugs in a controllable manner. However, most currently available stimuli-responsive nanomedicines rely on surrounding extreme stimulus to trigger the activity, which can be inefficient under dynamic and complex living conditions. Herein, we report a near-infrared (NIR) light-responsive nanocomposite, which can generate reactive oxygen species to efficiently trigger the decomposition upon NIR laser irradiation. This nanocomposite is fabricated by conjugating polyamidoamine-pluronic F68 and graphene oxide via diselenide bond, and encapsulating the NIR photosensitizer indocyanine green and chemotherapeutic drug doxorubicin (DOX) as payloads. Under NIR light, the nanocomposite shows lysosomal escape, controlled drug release , and nuclear trafficking of DOX inside multidrug resistant (MDR) MCF-7/ADR cells. Interestingly, this nanocomposite effectively down-regulates ABCB1 gene and P-glycoprotein of MCF-7/ADR cells, exhibiting significant cytotoxicity. In vivo anti-tumor study demonstrates an effective accumulation and superior therapeutic efficacy of this multifunctional nanocomposite in MCF-7/ADR tumors, representing a great potential for clinical treatment of MDR cancer.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yuqian Liu,Qingsheng Guo,Xiaojun Qu,Qingjiang Sun
The combination of functional nucleic acids and nanomaterials enables the continuous development of hybrid nanosystems that have found wide applications including chemo/biosensing. Herein, we report the supramolecular assembly of a “sesame biscuit”-like superstructural nanosystem based on aptamer, quantum dot (QD), and graphene oxide (GO), and its diverse applications in Pb2+ and pH sensing. The nanosystem was assembled via adsorbing silica-encapsulated green-emitting QD onto the edge of GO by ionic interaction, followed by absorbing aptamer-modified red-emitting QD onto the GO surface via the π-stacking interaction. The nanosystem showed the characteristic of the nonquenched green fluorescence due to silica encapsulation and quenched red fluorescence owing to nanomaterial surface energy transfer. The nanosystem responded to Pb2+/pH in ratiometric fluorescence: the red fluorescence varied upon analyte-driven conformational changes of the aptamer, whereas the green one remained constant. Under optimized conditions, the nanosystem was demonstrated to be capable of quantifying Pb2+ with a detection limit of 11.7 pM, as well as pH with a sensing resolution of 0.1 pH unit. More importantly, the ratiometric nanosystem facilitated visualization of analytes in a distinct “traffic light” manner, which was exemplified by semiquantification of exogenous Pb2+ in living cells. To demonstrate practicality, fluorescent test strips were fabricated by immobilizing the nanosystem on paper. The fluorescent test strips displayed traffic light-type fluorescence color changes, with the capacity for on-site, naked-eye detection of Pb2+ in real samples, as well as point-of-care pH testing in routine urinalysis.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Rongfeng Tang,Xiaomin Wang,Chenhui Jiang,Shiang Li,Weifeng Liu,Huanxin Ju,Shangfeng Yang,Changfei Zhu,Tao Chen
Sb2S3 is a kind of new light-absorbing material possessing high stability in ambient environment, high absorption coefficient in the visible range, and abundant elemental storage. To improve the power conversion efficiency of Sb2S3-based solar cells, here we control the defect in Sb2S3 absorber films. It is found that the increase of sulfur vacancy is able to upgrade photovoltaic properties. With the increase in sulfur vacancy, the carrier concentrations are increased. This n-type doping gives rise to an upshift of the Fermi level of Sb2S3 so that the charge transport from Sb2S3 to the electron selection material becomes dynamically favorable. The introduction of ZnCl2 in film fabrication is also found to regulate the film growth for enhanced crystallinity. Finally, the photovoltaic parameters, short-circuit current density, open-circuit voltage, and the fill factor of the device based on the Sb2S3 film are all considerably enhanced, boosting the final power conversion efficiency from 5.15 to 6.35%. This efficiency is the highest value in planar heterojunction Sb2S3 solar cells and among the top values in all kinds of Sb2S3 solar cells. This research provides a fundamental understanding regarding the properties of Sb2S3 and a convenient approach for enhancing the performance of Sb2S3 solar cells.
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