MATERIALS TECHNOLOGY
·
2018
·
IF 1.232
Guangyu Wu,Weinan Xing
Heterogeneous semiconductor photocatalysis has been considered as a cost-effective alternative for the eliminating hazardous pollutants and generating sustainable energy. Graphene, a 2D allotrope of carbon, has received significant attentions due to its outstanding properties. In this work, a highly efficient visible-light-driven ternary heterostructure semiconductor RGO/Ag2O/Ag2WO4 (RGAAW) Ag-based photocatalyst was prepared and its photocatalytic activity was evaluated by photodegradation of methylene orange (MO). The morphology, structure and optical absorption properties of the as-prepared RGAAW were characterized by SEM, XRD, XPS, FT-IR and UV−vis DRS, respectively. The obtained result was found that the as-prepared RGAAW exhibited the excellent photocatalytic activity, which was almost 11.5 and 7 times as high as those of individual Ag2O and Ag2WO4, respectively. The enhancement of photocatalytic performance could be attributed to the reduced graphene oxide sheets can function as an electron collector and transporter to lengthen the lifetime of the charge carriers. Moreover, the as-prepared RGAAW showed excellent stability toward the photodegradation of methyl orange (MO). The possible mechanism of photocatalytic activity enhancement was proposed.
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高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 11
·2596-2599
·
IF 4.495
Xin Fan,Yanling Yao,Yangsen Xu,Lei Yu,Chuntian Qiu
In this work, a highly efficient PCN-KCl (KCl-modified polymeric carbon nitride) nanosheet photocatalyst was synthesized with the assistance of KCl. The as-prepared PCN-KCl catalyst shows a more than 30-fold enhancement in the photocatalytic activity for H 2 evolution from water compared to the pristine PCN. More importantly, when PCN-KCl was composited with a second catalyst (Pd nanoparticles), the simultaneous production and utilization of active H species for alkenes hydrogenation was achieved by visible light irradiation under ambient conditions. Graphical Photo-ready : One-step photocatalytic generation of hydrogen from water and its subsequent utilization for reduction reactions was demonstrated with typical examples of olefin hydrogenation into the corresponding alkanes over a Pd/PCN-KCl bifunctional photocatalyst under mild conditions.
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 102
·100519-100525
·
IF 3.289
Fei Wang,Yang Qiu,Bing-Jie Wang,Hua-Lin Wang,Yi-Tao Long
A green method was developed to fabricate a novel porous polymer microsphere with SERS activity, which can be used for ultrasensitive detection because of its preconcentration function. Ultraviolet irradiation as “green” reduction was successfully achieved through several complex processes, namely, monomer solidification, hydrogen peroxide photolysis, and silver nanoparticle fabrication, in only one step. During the solidification process, H2O and O2, which are originally from H2O2 reduction, escaped from the emulsion templates, resulting in various interconnected micro-/nano-channels. The mean pore size of the prepared porous microspheres was 4 μm, and the specific surface area can reach 31 m2 g−1. The silver nanoparticles produced in the reduction process of silver nitrate were deposited on the porous surface of the microsphere and contributed to stable SERS activity with a SERS enhancement factor of up to 3.8 × 106 and a low detection limit of 10−13 M level for rhodamine 6G. This green method provides highly sensitive and uniform SERS substrates and ensures the stability and reliability of our “SERS substrate”.
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高影响因子
Journal of Physical Chemistry Letters
·
2021
·
IF 6.475
Li Song,Lixin Huang,Yuan Liu,Xiaoyang Guo,Chong Geng,Shu Xu,Yuanqin Xia,Yuan Zhang,Nannan Luan,Yongsheng Hu
Physical vapor deposition has emerged as a promising strategy for efficient and stable all-inorganic perovskite light-emitting devices (PeLEDs). However, the thermally evaporated PeLEDs still suffer from unsatisfactory optoelectrical performance because of the massive nonradiative defects. Herein, we demonstrate an efficient bilateral interfacial defect-passivation strategy toward high-performance PeLEDs with a thermally deposited CsPbBr3 emissive layer (EML). Specifically, the nonradiative defects from the bulk as well as the EML/charge transport layer (CTL) interface are significantly suppressed by implementing the 3-amino-1-propanol (3AP)-modified PEDOT:PSS and introducing ammonium salts, respectively. Simultaneously, both the 3AP induced less-conductive Cs4PbBr6 and ammonium salts can balance the charge injection into the EML effectively. As a result, we achieved efficient PeLEDs based on thermally evaporated CsPbBr3 with a luminance of 15745 cd/m2, current efficiency of 32 cd/A, external quantum efficiency of 8.86%, and lifetime of 3.74 h. The strategy proposed here may shed light on the development of highly efficient thermally evaporated PeLEDs.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Jian Chen,Xiaoping Tao,Lin Tao,He Li,Chunzhi Li,Xiuli Wang,Can Li,Rengui Li,Qihua Yang
Artificial photosynthesis aiming to capture and convert renewable solar energy into solar fuels (e.g., hydrogen, chemicals) provides a blueprint for sustainable and carbon-neutral world. In artificial photosynthesis, developing novel semiconductors for visible-light-driven photocatalytic water splitting is one of the most demanding challenges. Herein, we designed and explored two kinds of novel bipyridine-based covalent organic polymers, Bp-COP (2,2′-bipyridine-5,5′-diamine: Bp-NH 2 ) and BpZn-COP (2,2′-bipyridine-5,5′-diamine Zn complex: Bp-Zn), both of which exhibit excellent light-harvesting properties with absorption edges expanding to larger than 600 nm and have appropriate band structures for water splitting. Polymers Bp-COP and BpZn-COP are found to enable efficient photocatalytic hydrogen production under visible light irradiation with Pt as the proton reduction cocatalyst. Further assembling conjugated organic polymers with TiO 2 as charge transferring mediate can remarkably boost their photocatalytic activities to more than 8 times (1333 vs. 162 μmol g −1 h −1 ), giving an apparent quantum efficiency (AQE) of over 2.5% at the input wavelength of 420 nm. This work not only presents a methodology for designing and synthesizing novel organic-based polymers, but also provides promising candidates for potential applications in solar energy conversion.
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高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 12
·2567
·
IF 2.217
Dongpeng Zhao,Qiuchen Lu,Runzhou Su,Yuanzuo Li,Meiyu Zhao
The photovoltaic properties of two dyes (quercitin (Q) and rutin (R)) were experimentally investigated. The results showed that Q had excellent photoelectric properties withJscof 5.480 mA·cm−2,Vocof 0.582 V,ηof 2.151% larger than R withJscof 1.826 mA·cm−2,Vocof 0.547 V, and η of 0.713%. For a better understanding of the photoelectric properties of two molecules and illustrating why the performances of Q is better than R from the micro-level, the UV-VIs spectrum, Fourier transforms infrared (FT-IR) spectrum, and cyclic voltage current characteristics were experimentally investigated. What is more, density functional theory (DFT) and time dependent density functional theory (TD-DFT) have been implemented in theoretical calculation. Based on the calculated results, frontier molecular orbitals (FMOs), charge differential density (CDD), infrared vibration, first hyperpolarizability, projected density orbital analysis (PDOS), electrostatic potential (ESP), and natural bond orbital (NBO) were analyzed. Hole/electron reorganization energies (λh/λe), light harvesting efficiency (LHE), fluorescent lifetime (τ), absorption peak, and the vertical dipole moment (μnormal) were calculated, and the shift of conduction band edge of a semiconductor (ΔECB) has been analyzed, which has a close relationship withJscandVoc. The results demonstrated that, due to the higher LHE, τ,μnormal, and red-shifted absorption peak, Q has better photoelectric properties than R as a promising sensitizer.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 33
·11649-11657
·
IF 4
Zikai Meng,Zhen Guo,Jiajia Cao,Zihui Li,Jihua Zhu,Zhenbin Wang,Cunhua Ma,Mingjin Zhang,Weisheng Liu
In recent years, a series of persistent luminescence materials excitable by blue light have been developed and widely used in many fields such as optical information storage, AC-LEDs, anti-counterfeiting and bio-imaging. However, it is still a long-standing challenge to develop a superior red-emitting persistent phosphor that can be efficiently excited by blue light. In this work, a novel blue-light excited red-emitting persistent phosphor CaCd2Ga2Ge3O12:Pr3+ was successfully synthesized by using a solid-state method, showing excellent luminescence properties. Moreover, the phase purity, crystal structure, photoluminescence spectra, afterglow emission spectra, and three-dimensional thermoluminescence spectrum were successfully investigated. Under 294 nm excitation, photoluminescence spectra show a single orange emission and a series of peaks centered at 492, 537, 568, 614 and 664 nm, which correspond to the 3P0 → 3H4, 3P0 → 3H5, 3P2 → 3H6, 1D2 → 3H4, and 3P0 → 3F2 transitions of Pr3+, respectively. Interestingly, after blue light excitation, the afterglow luminescence exhibits red long emission, which is attributed to the 1D2 → 3H4 transition of Pr3+. Through thermoluminescence spectra and three-dimensional thermoluminescence spectra, we analyze the reasons for the different colors of photoluminescence and afterglow luminescence. The results imply that there are two types of traps, and the depth of shallow traps and deep traps is calculated to be 0.684 and 0.776 eV, respectively. It is worth noting that the photoluminescence is attributed to the 4f2 → 4f5d and f → f transitions of Pr3+, and the afterglow luminescence is ascribed to a tunneling-related process and the transition of electrons from the valence band to the conduction band. The obtained red-emitting persistent phosphors provide a promising pathway toward AC-LEDs, multi-cycle bio-imaging and other fields.
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高影响因子
Materials Horizons
·
2019
·Vol. 6
·期 5
·1013-1019
·
IF 14.356
Di Chen,Yue Zhang,Chujun Ni,Chao Ma,Jie Yin,Hao Bai,Yingwu Luo,Feihe Huang,Tao Xie,Qian Zhao
Dynamic covalent polymer networks exhibit a unique stress relaxation behavior under mechanical deformation, which enables sophisticated shape manipulation in addition to their widely recognized capabilities of self-healing and thermoset recycling. Here we present an unusual ice-templated photo-patterning technique employing a disulfide-crosslinked hydrogel capable of photo-induced network rearrangement. First, freezing creates internal mechanical stress since the resulting ice crystals squeeze the polymer chains. Secondly, spatio-temporal UV light irradiation at this frozen state leads to localized stress relaxation via disulfide bond exchange. At the last step, subsequent ice melting leads to pore patterns, the porosity of which can be controlled by the light dosage. Taking advantage of the stimuli-responsiveness of the hydrogel, one single patterned sample is used as an adaptive stamp to produce multiple functional devices (e.g. antenna).
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 20
·14337-14349
·
IF 2.993
He Shuai,Li Hui,Chen Hualin
The dispersion of graphene in water has generally been considered an insurmountable challenge owing to its hydrophobic nature. In this study, a new type of light-sensitive polymer/graphene composite (AzoPEO/β-CD–RGO) was synthesized by the reversible host–guest interaction between azobenzene-terminal poly(ethylene oxide) (AzoPEO) and a β-cyclodextrin (β-CD) host attached to the surface of graphene via hydrogen bonding. In water, the AzoPEO/β-CD–RGO composite not only is well dispersed, but also exhibits reversible dispersion/aggregation behavior triggered by UV and visible light. Moreover, the graphene composite can be used to fabricate a light-responsive graphene-based drug delivery system. This kind of light-responsive graphene composite, which efficiently allows the control of graphene dispersion/aggregation, may find wide applications in the preparation of intelligent drug delivery systems, smart sensors, and switching devices.
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高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Shuling Zhou,Yupu Ma,Xinfeng Zhang,Wei Lan,Xingjian Yu,Bin Xie,Kai Wang,Xiaobing Luo
In quantum-dots-converted white-light-emitting diodes (QDs-WLEDs), red-emitting quantum dots are usually mixed with yellow-emitting phosphors in luminescent polymer layer to achieve a high color rendering index. However, the thermal stability of QDs is severely challenged by the high working temperature of the luminescent polymer layer with a low thermal conductivity. In this work, we enhanced the vertical thermal conductivity of the luminescent layer by filling vertically arranging hexagon boron nitride sheets (hBNS) inside using an ice template method. This created a relatively high thermal conductivity heat dissipation channel for luminescent particles. Sodium carboxymethylcellulose templates were created to support the vertically arranging hBNS. Using the proposed method, we fabricated a new package design of vertical-enhanced QDs-WLEDs (Ver-WLEDs) and compared its thermal performance with that of isotropic-enhanced QDs-WLEDs (Iso-WLEDs) and common QDs-WLEDs (Com-WLEDs). At the same working current, the maximal working temperature of Ver-WLEDs (116 °C) was 36 and 21 °C lower than that of Iso-WLEDs (152 °C) and Com-WLEDs (137 °C), respectively. Our novel method to enhance the vertical thermal conductivity of luminescent polymer layer could shed light on the application of QDs in high-power light-emitting diodes.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Ziwei Lin,Sheng Wang,Qing Yan,Qinghua Yan,Derong Cao
Light is not the only stimuli which can coverts donor-acceptor Stenhouse adducts (DASAs) from the triene to the cyclopentenone form. Here, we firstly demonstrate that Cu 2+ can drive linear-to-cyclic isomerization of DASAs in acetonitrile , which increase the rate of color fading. Three different generations of DASAs ( DASA-1 , DASA-2 , and DASA-3 ) have been synthesized by Knoevenagel condensation to verify the universal applicability of the mechanism by which copper ions discolor DASAs. The Job's plot of DASA-1 to Cu 2+ indicated DASA-1 binds to Cu 2+ with a ratio of 1:1, and the 1 H NMR titration spectrum of Cu 2+ on DASAs as well as the UV–Vis absorption spectra with adding Cu 2+ showed that copper ions could induce the process of linear-to-cyclic isomerization of DASAs in acetonitrile. Based on this, we propose copper ions as the eraser of a DASA derived ink to achieve repeatable erasing. Furthermore, DASAs have been utilized as a Cu 2+ sensor with high selectivity and sensitivity.
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高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-15
·
IF 16.6
He Ning,Wang Xiaonan,Shi Liyang,Li Jing,Mo Lan,Chen Feng,Huang Yuting,Liu Hairong,Zhu Xiaolong,Zhu Wei,Mao Yiqi,Han Xiaoxiao
Light-based 3D bioprinting is now employed widely to fabricate geometrically complex constructs for various biomedical applications. However, the inherent light scattering defect creates significant challenges in patterning dilute hydrogels to form high-fidelity structures with fine-scale features. Herein, we introduce a photoinhibiting approach that can effectively suppress the light scattering effect via a mechanism of simultaneous photoabsorption and free-radical reaction. This biocompatible approach significantly improves the printing resolution (~1.2 - ~2.1 pixels depending on swelling) and shape fidelity (geometric error less than 5%), while minimising the costly trial-and-error procedures. The capability in patterning 3D complex constructs using different hydrogels is demonstrated by manufacturing various scaffolds featuring intricate multi-sized channels and thin-walled networks. Importantly, cellularised gyroid scaffolds (HepG2) are fabricated successfully, exhibiting high cell proliferation and functionality. The strategy established in this study promotes the printability and operability of light-based 3D bioprinting systems, allowing numerous new applications for tissue engineering.
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PubMed
高影响因子
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