NANOTECHNOLOGY
·
2022
·Vol. 33
·期 17
·175401
·
IF 3.953
Xiyu Deng,Xinya Kuang,Jiyang Zeng,Baoye Zi,Yiwen Ma,Ruihan Yan,Jin Zhang,Bin Xiao,Qingju Liu
Photocatalytic water splitting is considered to be a feasible method to replace traditional energy. However, most of the catalysts have unsatisfactory performance. In this work, we used a hydrothermal process to grow Ag nanoparticles in situ on g-C3N4 nanosheets, and then a high performance catalyst (Ag–g–C3N4) under visible light was obtained. The Ag nanoparticles obtained by this process are amorphous and exhibit excellent catalytic activity. At the same time, the local plasmon resonance effect of Ag can effectively enhance the absorption intensity of visible light by the catalyst. The hydrogen production rate promote to 1035 μmol g−1 h−1 after loaded 0.6 wt% of Ag under the visible light, which was 313 times higher than that of pure g-C3N4 (3.3 μmol g−1 h−1). This hydrogen production rate is higher than most previously reported catalysts which loaded with Ag or Pt. The excellent activity of Ag-g-C3N4 is benefited from the Ag nanoparticles and special interaction in each other. Through various analysis and characterization methods, it is shown that the synergy between Ag and g-C3N4 can effectively promote the separation of carriers and the transfer of electrons. Our work proves that Ag-g-C3N4 is a promising catalyst to make full use of solar energy.
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BioDesign Research
·
2024
·
IF 0
Xinyue Gui,Fei Li,Xinyu Cui,Ranran Wu,Dingyu Liu,Chunling Ma,Lijuan Ma,Huifeng Jiang,Chun You,Zhiguang Zhu
Terpenoids of substantial industrial interest are mainly obtained through direct extraction from plant sources. Recently, microbial cell factories or in vitro enzymatic biosystems have emerged as promising alternatives for terpenoid production. Here, we report a route for the synthesis of α-farnesene based on an in vitro enzyme cascade reaction using methanol as an inexpensive and renewable C1 substrate. Thirteen biocatalytic reactions divided into 2 modules were optimized and coupled to achieve methanol-to-α-farnesene conversion via integration with natural thylakoid membranes as a green energy engine. This in vitro enzymatic biosystem driven by light enabled the production of 1.43 and 2.40 mg liter−1 α-farnesene using methanol and the intermediate glycolaldehyde as substrates, respectively. This work could provide a promising strategy for developing light-powered in vitro biosynthetic platforms to produce more natural compounds synthesized from C1 substrates.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yingying Wang,Runchi Wang,Yingchao Ge,Chong Geng,Shu Xu
Lead halide perovskite nanocrystals (PNCs) have demonstrated great potential in emerging display technologies. However, the practical application of PNCs is hindered by the inherent instability of their ionic surface. Here, we proposed a surface modification approach to enhance the stability of CsPbBr3 PNCs by postsynthetic treatment with aluminum phenylbutyrate (Al(PA)3). Our study reveals that Al(PA)3 displaces ammonium ligands and binds tightly on surface halide, providing excellent air and moisture resistance while preserving a high quantum efficiency of 81.6%. The modified PNCs maintain a constant photoluminescence intensity under continuous UV light illumination for 500 h. Additionally, the Al(PA)3 ligand is compatible with styrene, enabling homogeneous dispersion of PNCs in polystyrene matrices to form bright and uniform PNC–PS thin films. We demonstrated the application of the composite films for display backlighting, which exhibits a wide color gamut of 125% NTSC. The result highlights the potential of AlPA-modified PNCs in light-emitting and other optoelectronic devices.
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IEEE JOURNAL OF QUANTUM ELECTRONICS
·
2020
·Vol. 56
·期 3
·1-9
·
IF 2.384
Zong-Tao Li,Jie-Xin Li,Jia-Sheng Li,Zi-Hao Deng,Yue-Hua Deng,Yong Tang
The scattering effect plays an important role in improving the optical performance of the quantum dot (QD) white light-emitting diodes (LEDs). A majority of the previous studies have focused on the planar packaging structure only with respect to total internal reflection (TIR). In this study, SiO2 nanoparticles are incorporated into QD-silicone encapsulation of LEDs with semi-spherical lens packaging (SSLP) to exploit their scattering effect. The results show that the radiant efficacy (31.35%@100 mA) and luminous efficacy (87.56 lm/W@100 mA) of QD white LEDs can be optimized using SiO2 nanoparticle concentration (0.1 wt%) and that they increase by 5.04% and 11.08%, respectively, as compared to the conventional structure. A comprehensive ray-tracing simulation validates that the nanoparticles in the SSLP structure lead to severe loss of chip light. On the contrary, the fluorescence light increases due to the enhancement of conversion by QDs. The transmission electron microscopy images and the finite-difference time-domain simulation have been introduced to investigate the surface adsorption of SiO2 nanoparticle. This study indicates that SiO2 incorporation is an effective method to improve the efficiency of QD white LEDs, and provides a better understanding on the scattering effect based on TIR, color conversion, and surface adsorption.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Zhiwei Chen,Yuyu Bu,Lin Wang,Xiao Wang,Jin-Ping Ao
In this paper, we prepare porous g-C 3 N 4 by hydrothermal process, and then Rh atoms are anchored on the carbon nitride framework. After further phosphating, a novel single-sites-like Rh-phosphide (Rh-P) modified carbon nitride photocatalyst is fabricated. The photocatalytic hydrogen evolution rate of Rh-P modified carbon nitride is 33 times higher than that of pure C 3 N 4 . Structure analysis results show that Rh-P dots are dispersed with single-sites state on the surface of carbon nitride framework. Further theoretical calculation and the photoelectrochemical results reveal that Rh-P single-sites on carbon nitride provide photogenerated convergence centers to decrease the hydrogen evolution potential and enhance the free charge transfer capability. Thus, it improves the photocatalysis hydrogen evolution performance of the carbon nitride.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lili Li,Yingdan Song,Hongxin Song,Kaige Cheng,Qiang Xu,Lei Zhao
The light waveguiding effect of transparent glass ceramics (GCs) on mechanoluminescence (ML) signals is highly attractive for remote stress sensing and structural health monitoring applications. However, a prerequisite for generating ML in GCs is pre-irradiation with high-energy rays, which not only increases application costs but also poses a risk of GCs devitrification. Herein, we propose a safe, non-destructive, and convenient charging method for the ML of KMgF 3 : Tb 3+ GCs, namely ultraviolet (UV) light charging. By effectively filling the intrinsic defects in KMgF 3 : Tb 3+ nanocrystal using UV light, we achieved trap-controlled ML in rigid GCs. Moreover, this ML is attributed to thermoluminescence (TL) induced by frictional heating during mechanical stimulation. Additionally, when the GCs powder is combined with flexible polydimethylsiloxane (PDMS), a self-powered (without any pre-charging) ML induced by interfacial triboelectricity can also be achieved, which is similar to the results observed in most flexible ML systems. This work proposes a more straightforward and safer approach for applications such as mechanical sensing based on the ML of transparent GCs.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Shuhan Jiang,Yujie Jia,Xiaoxia Yang,Qianchen Ou,Yanan Liu,Siqian Zhang,Dianwu Huang,Hongmei Wang
FeCo-LDH/g-C 3 N 4 S-type heterojunction photocatalysts were successfully prepared by thermal polymerization and electrostatic self-assembly methods. The structure, morphology, light absorption and photoelectrochemical properties of the prepared samples were characterized. The photocatalytic properties of the photocatalysts were evaluated by the degradation of tetracycline (TC) and photocatalytic hydrogen evolution from water splitting under visible light irradiation. The experimental results showed that the photocatalytic properties of FeCo-LDH/g-C 3 N 4 nanocomposites were superior to those of pristine g-C 3 N 4 . In addition, when the mass ratio of FeCo-LDH to g-C 3 N 4 was 7:100, the photocatalytic performance of the as-prepared FeCo-LDH(7 %)/g-C 3 N 4 is the optimal. The TC degradation rate of FeCo-LDH(7 %)/g-C 3 N 4 reached 78.0 % within 120 min, which was 2.63 times of that of pure g-C 3 N 4 . And the photocatalytic hydrogen evolution of FeCo-LDH(7 %)/g-C 3 N 4 was 107.28 μmol for 4 h, which was 12.68 times that of g-C 3 N 4 . The results showed that the as-prepared FeCo-LDH/g-C 3 N 4 nanocomposite photocatalysts have excellent performance in the degradation of TC and the photocatalytic H 2 evolution. Meanwhile, the EPR and trapping experiments revealed that OH and O 2 − played a main role in the photocatalytic TC degradation. The mechanism of photocatalytic TC degradation and hydrogen production of FeCo-LDH/g-C 3 N 4 nanocomposite photocatalysts was also discussed.
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POLYMER
·
2018
·
IF 3.483
Wenbo Shen,Ling Wang,Tingjun Zhong,Gang Chen,Chunxin Li,Mei Chen,Cuihong Zhang,Lanying Zhang,Kexuan Li,Zhou Yang,Huai Yang
In this paper, we report the design, preparation and properties of epoxy-mercaptan polymer/nematic liquid crystal (LC) composites with electrically switchable optical transmittance. It is found that the polymer microstructure can be regulated from porous structure to microspheres or beads by appropriately modulating the curing temperature, the molecular structure of mercaptan, as well as the compositions of epoxy, mercaptan and nematic LC host. Under an external electric field, the thin films based on such composites can switch from opaque to transparent. The electro-optical performance is found to be highly dependent on the polymer microstructures and the optimum characteristics can be achieved in the composite with a microstructure of smaller microspheres. The possible mechanism for the formation of polymer microspheres and the effects of the microstructures on the electro-optical characteristics of the composites are also discussed. This work is expected to provide an efficient way to control the microstructure of epoxy/mercaptan polymer and develop the composites with switchable optical transmittances for both civil and military applications.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 51
·11975-11982
·
IF 5.16
Xin-Yue Lou,Nan Song,Ying-Wei Yang
Graphical White-light emission : An anthracene-bridged pillar[5]arene dimer with persistent and strong mazarine blue fluorescence in both solution and the solid state was synthesized. Its supramolecular assemblies, upon binding with fluorescent guests through host–guest interactions in various solvents, exhibit tunable fluorescence, including white-light emission (see figure). Organic luminescent materials with high quantum yields and/or white-light-emitting properties in particular play a crucial role in labeling and optoelectronic devices. In this work we have synthesized a new 2,3,6,7-tetramethoxy-9,10-di- p -tolylanthracene-bridged pillar[5]arene dimer with persistent mazarine blue fluorescent emission and much higher quantum yields in both solution and the solid state in comparison with its corresponding emissive linker without pillarene units, which exhibits typical aggregation-caused quenching. According to the fluorescence data and single-crystal analyses, their contrasting fluorescent performances can be rationally ascribed to their different stacking structures and intermolecular interactions. Three fluorescent guests containing different chromophores and/or terminal binding sites have also been synthesized to interact with the pillar[5]arene dimer to construct supramolecular ensembles with highly controllable luminescence, taking advantage of the stimuli-responsive properties of the supramolecular host–guest interactions. Intriguingly, multicolor fluorescence, including white-light emission (0.31, 0.35), which is in high demand, has been achieved by tuning the molar ratio of the host and guest and/or by changing the solvent system. This strategy holds great potential for the design and development of fluorescent materials with high quantum yields, controllable emission wavelength, and good stimuli-responsiveness.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2016
·Vol. 301
·期 9
·1111-1120
·
IF 2.834
Liang Fang,Tianyu Fang,Xiaoxia Liu,Shunping Chen,Chunhua Lu,Zhongzi Xu
Light triggered soft actuator in aqueous media has applications in operating underwater objects, creating liquid flow, and adjusting reaction velocity, etc. Here, composites prepared from commercial materials, poly[ethylene- ran -(vinyl acetate)] (EVA) and aniline black (AB), are reported as one cost efficient material for preparing such actuator, where EVA and AB work respectively as shape-memory polymer matrix and near-infrared light triggered photothermal filler. Upon irradiation, the temperature of the composites increases greatly with light power density and AB content. Light-induced shape-memory effect (SME) with recovery ratio >98%, temperature-memory effect (TME), and reversible bidirectional shape-memory effect (rbSME) of the prepared composites in air are realized. Higher light power density is required to trigger the shape recovery in aqueous media, while good SME, TME, and rbSME are also achieved. Releasing device and gripper are used to indicate the feasibility of the composites as light triggered soft underwater actuators.
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RSC Advances
·
2016
·Vol. 6
·期 60
·54964-54975
·
IF 3.289
Jian Zeng,Ting Song,Meixiang Lv,Tingting Wang,Jiayi Qin,Heping Zeng
A Au/g-C3N4/NiFe2O4 nanocomposite was successfully prepared and characterized, and it exhibited a significant visible-light-driven photoactivity for hydrogen production. The results suggested that NiFe2O4 was closely coupled with flake-like g-C3N4 and Au nanoparticles were successfully loaded onto the surface of an optimal g-C3N4/NiFe2O4 nanocomposite. Subsequently, the photocatalytic hydrogen evolution of the as-prepared sample was investigated and optimized, indicating that the optimal Au/g-C3N4/NiFe2O4 ternary nanocomposite with AuNP loading of 1.0 wt% showed the highest hydrogen generation rate of 1.607 mmol g−1 h−1, which was 30.9 times and 28.7 times higher than the values of pure NiFe2O4 and pure g-C3N4, respectively, whereas the optimized g-C3N4/NiFe2O4 binary nanocomposite with NiFe2O4 coupled at 49.4% exhibited a hydrogen generation rate of 0.351 mmol g−1 h−1. Interestingly, the photocatalytic hydrogen production mechanism was also tentatively proposed as promoted charge carrier transfer and the strong surface plasmon resonance (SPR) effect of AuNPs via PL, EIS and photocurrent measurements was verified.
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Nano Energy
·
2014
·
IF 10.211
Lingling Zhang,Lu Bai,Miao Xu,Lei Han,Shaojun Dong
A membrane-less ethanol/air biofuel cell (BFC) with both the anode and cathode driven by visible light has been assembled. Simply upon a light source illumination, the BFC generates the maximum power density of 0.27 mW cm −2 with an open circuit voltage of 1.13 V, realizing the dual route energy conversion of light energy and chemical energy to electricity, improving the energy utilization efficiency.
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