CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jin Qin,Zuo Tian,Gang Chen,Yu Zhao
Bismuth-based semiconductor materials have garnered significant attention because of their appropriate optical bandgap and substantial photoelectric conversion efficiency. Enhancing the photocurrent and fill factor of photovoltaic films is essential for developing high-performance optoelectronic devices. In this study, high-performance BiVO 4 -ZnTiO 3 multilayer films were fabricated using a straightforward sol-gel method, where the incorporation of ZnTiO 3 films significantly improved the photovoltaic performance of BiVO 4 . Through structural design aimed at enhancing light utilization, the BiVO 4 -ZnTiO 3 multilayer film achieved a photocurrent density of 1.9 mA/cm 2 at 450 nm, along with a fill factor of 46.8 % in the composite multilayer structure. The improvement in film performance is attributed to the overall multilayer stacking effect. This study offers a novel approach for utilizing bismuth-based semiconductors in optoelectronics.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Advanced Powder Materials
·
2022
·
IF 0
Meng Li,Jingxue Sun,Gang Chen,Shuang Wang,Shunyu Yao
The CdS/Bi 2 S 3 supported three-dimensional (3D) porous faveolate carbon structure (CdS/Bi 2 S 3 @C) composite photocatalyst was constructed. Bi 2 S 3 nanoparticles are regarded as photothermal agents and pyroelectric materials to absorb near infrared light (NIR) and convert it into heat. 3D porous faveolate of carbon acts as incubator to reduce heat loss and optimize photothermal effects. There is a greater fluctuating temperature difference (Δ Τ ) between photothermal effect of Bi 2 S 3 and cold photocatalytic system. This enhances the pyroelectric effect that Bi 2 S 3 undergoes spontaneous polarization and releases the surface charge. Therefore, the separation of electrons and holes in the CdS photocatalyst can be induced. The COMSOL simulation results show that, the higher pyroelectric potential producted by larger Δ Τ is more favorable to the photocatalytic process. The hydrogen evolution rate of CdS/Bi 2 S 3 @C photocatalyst can reach 5.88 mmol·g − 1 ·h −1 with excellent cycle stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
Journal of the American Chemical Society
·
2020
·
IF 14.612
Zhuang Hu,Shaojie Liu,Haiyan Qin,Jianhai Zhou,Xiaogang Peng
By taking advantage of well-defined spectroscopic signatures of high-quality CdSe/CdS core/shell QDs, the effects of oxygen on photoluminescence (PL) of QDs were studied systematically and quantitatively at both single-dot and ensemble (on substrate and in solution) levels, which reveals a unified yet simple picture. With a sufficient amount of oxygen in the system during photoexcitation, the core/shell QDs in all forms would be deionized timely from the photogenerated and inefficient trion state back to the efficient single-exciton state, with superoxide radicals as the reduction product of oxygen. Under a given excitation power, rates of both spontaneous deionization and photodeionization channels increased by increasing the oxygen pressure, but photoionization of the QDs was barely affected by the oxygen pressure. While stabilizing PL by oxygen was identified for both CdSe plain core and CdSe/CdS core/shell QDs, irreversible photocorrosion was only observed for CdSe plain core QDs, suggesting the importance of high-quality epitaxial shells for QDs in various applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Lei Tong,Xiaoyan Duan,Luyao Song,Tiande Liu,Lei Ye,Xinyu Huang,Peng Wang,Yuanhui Sun,Xin He,Lijun Zhang,Ke Xu,Weida Hu,Jian-Bin Xu,Jianfeng Zang,Gary J. Cheng
Intrinsic linear polarized optics discovered in anisotropic two-dimensional (2D) materials has attracted intense interest for polarization-sensitive optical and optoelectronic applications , such as black phosphorous, ReSe 2 , etc. However, the lack of matured method to synthesize high-quality, large-scale and air-stable 2D materials with anisotropic properties, is still an obstacle for practical applications. Monolayer molybdenum disulfide (MoS 2 ), which exhibits strong direct-band-gap light-harvesting properties, can be grown maturely. But unfortunately, MoS 2 does not show linear dichroism owing to its in-plane isotropic crystalline symmetry. We, herein, for the first time, report on an artificial control of extrinsic linear polarized photoelectric effect in monolayer MoS 2 , by successfully controlling its anisotropic degree of in-plane crystal symmetry via artificially induced uniaxial tensile strain . Strong linear polarization-sensitive photodetection from visible to near-infrared range is realized for monolayer MoS 2 -based device, and the polarization anisotropic ratio can reach up over 2.0 under 4.5% strain. The observation is supported by combination of experiment-theory study on polarized Raman spectrum and optical absorption under gradually applied strains. Our results have demonstrated that the artificial-controlled symmetry reducing of MoS 2 is a promising strategy to achieve high performance polarization photodetection. This method can also be extended to other 2D materials, which potentially opens up a new field to endow isotropic 2D materials with anisotropic functionalities by artificial structure engineering.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yichao Wang,Zipeng Xing,Huanan Zhao,Sijia Song,Meijie Liu,Zhenzi Li,Wei Zhou
Oxygen-doped MoS 2 @In 2 S 3 /Bi 2 S 3 core-shell dual Z-scheme tandem heterojunctions are fabricated via two-step hydrothermal methods. In 2 S 3 and Bi 2 S 3 nanosheets grow on the outer surface of oxygen-doped MoS 2 spheres, and the tight interface between the spheres could ensure stable electron transfer. MoS 2 with oxygen defects could inhibit the recombination of photo-induced electron-hole pairs. The unique core-shell structure increases the interface area and provides adequate surface reactive sites for the reactants. The resultant MoS 2 @In 2 S 3 /Bi 2 S 3 shows broad-spectrum response and excellent photothermal effect, which is beneficial to trigger the near-field temperature rise and promote the photocatalytic process. The MoS 2 @In 2 S 3 /Bi 2 S 3 exhibits excellent photocatalytic H 2 evolution rate of 973.42 μmol h −1 g −1 , and the degradation efficiency of tetracycline within 90 min is 99.6%, which is ∼ 10 times higher than that of pristine MoS 2 . It can be ascribed to the unique core-shell dual Z-scheme tandem heterojunction structure facilitates the transfer and spatial separation of photogenerated electron-hole pairs, and greatly prolongs the carrier lifetime. In addition, the long-term stability indicates the potential applications due to the core-shell dual Z-scheme tandem structure inhibiting the photocorrosion of sulfides.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 5
·778-784
·
IF 4.446
Yan Wei,Zhenlu Zhao,Ping Yang
Graphical Tip of the iceberg : Pd-tipped Au nanorods (NRs) are prepared in the presence of CTAB and 5-BrSA for the electrocatalytic hydrogen evolution reaction in the visible and near-infrared region. The tipped NRs exhibit a lower onset overpotential (40 mV) and higher exchange current density (1.585 mA/cm 2 ) than fully covered ones, which is ascribed to synergetic photothermal and photoelectric effects. Plasmonic bimetallic structures have been wildly used in photocatalysis, owing to their tunable optical properties and desirable catalytic activities. However, it is still a challenge to realize the enhanced electrocatalytic hydrogen evolution reaction (HER) using these structures with electric, photo-, and thermal effects. Herein, we report that Pd-tipped Au nanorods (NRs) were prepared for electrochemical water splitting in the visible and near-infrared region. The NRs exhibited a lower onset overpotential (40 mV) and high exchange current density (1.585 mA/cm 2 ), which was largely ascribed to the increased carrier density in Pd induced by photo-excited Au NRs, and further enhancement of Pd catalytic activity resulted from the photothermal effect of Au NRs. As the hot electron transport channel was hindered by excess Pd nanoparticles, it was found that the HER performance of tipped NRs was much higher than that of fully covered ones. This study extends enhanced electrocatalytic HER activity with plasmonic bimetallic structures by taking full advantage of the synergy between photoelectric and photothermal effects.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Methods and Applications in Fluorescence
·
2017
·Vol. 5
·期 4
·045001
·
IF 2.656
Zhongchen Bai,Licai Hao,Zhaoling Huang,Shuijie Qin,Zhengping Zhang
We studied an enhancement effect of defect fluorescence of ZnSe quantum dots (QDs) on a heterojunction of ZnSe QDs and gold nanoparticles. The photoluminescence (PL) of Au/ZnSe heterojunction is excited by using a 150 nm diameter ultraviolet laser spot of a scanning near-field optical microscope. Owing to the charge transfer of photon-generated carriers from ZnSe QDs, the enhanced PL effect is observed, which results from the increase of the built-in electric field to hinder the electron transfer to gold nanoparticles and is trapped by the defect states of ZnSe QDs. The broadening of defect fluorescence spectra and the reduction of excitonic fluorescence in multi-heterojunction of ZnSe QDs and gold nanoparticles are also observed which is attributed to an increase of their contact areas. We believe that enhanced defect fluorescence method described in this paper have potential applications in forming uniform optoelectronic heterojunction in controlling and boosting fluorescent efficiency of weak PL devices.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Materials Research Express
·
2023
·Vol. 10
·期 8
·086201
·
IF 2.3
Bing Liu,Jingheng Liang,Lili Wang,Zian Cheak Tiu
β-NaYF4: Yb3+/Tm3+/Zr4+ microcrystals are synthesized by a facile hydrothermal route. The up-conversion (UC) luminescence and photoelectric effects are enhanced simultaneously with the introduction of Zr4+ ions under IR excitation. With the Tm3+ ions fluorescence spectra under 980 nm excitation, the blue and red emissions reached the highest intensity in the case of 4 mol% Zr4+ doping. Taking the advantage of Zr4+ stimulates the free electrons transfer from the valence band (VB) to the conduction band (CB) in β-NaYF4:Yb3+/Tm3+/Zr4+ microcrystals, the photocurrent reached the highest intensity in the case of 4 mol% Zr4+ doping at 780 nm excitation. The β-NaYF4: Yb3+/Tm3+/Zr4+ microcrystals with both enhanced UC luminescence and photoelectric properties are highly potential to contribute in photovoltaic and infrared sensors application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 19
·6420
·
IF 3.4
Cheng Zou,Cheng Peng,Xiaopeng She,Mengqing Wang,Bo Peng,Yong Zhou
Pure tin oxide (SnO2) as a typical conductometric hydrogen sulfide (H2S) gas-sensing material always suffers from limited sensitivity, elevated operation temperature, and poor selectivity. To overcome these hindrances, in this work, hollow CuO-SnO2nanotubes were successfully electrospun for room-temperature (25 °C) trace H2S detection under blue light activation. Among all SnO2-based candidates, a pure SnO2sensor showed no signal, even toward 10 ppm, while the 1% CuO-SnO2sensor achieved a limit of detection (LoD) value of 2.5 ppm, a large response of 4.7, and a short response/recovery time of 21/61 s toward 10 ppm H2S, as well as nice repeatability, long-term stability, and selectivity. This excellent performance could be ascribed to the one-dimensional (1D) hollow nanostructure, abundant p-n heterojunctions, and the photoelectric effect of the CuO-SnO2nanotubes. The proposed design strategies cater to the demanding requirements of high sensitivity and low power consumption in future application scenarios such as Internet of Things and smart optoelectronic systems.
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 10
·3746-3755
·
IF 8.067
Dong-Yang Li,Yu Cheng,Yu-Han Hou,Jun-Hua Song,Chuan-Ju Sun,Cheng-Yang Yue,Zhi-Hong Jing,Xiao-Wu Lei
The concentration-caused quenching (CCQ) effect seriously deteriorates the photoluminescence (PL) efficiency of 0D organic–inorganic hybrid halide perovskites but reasonable management of CCQ via accurate structural design strategies remains a formidable challenge for PL property optimization. Herein, by fine-tuning the geometric configurations of organic cations, a controllable PL quenching-activation switch is realized by accurately modulating the CCQ effect. Specifically, we rationally designed a couple of 0D antimony halides, namely [BPP]SbCl5 (BPP = 1,3-bis(4-pyridyl)-propane) and [BPPP]SbCl5 (BPPP = 1,3-bis(4-piperidyl)-propane), based on the same [SbCl5]2− units. Through purposive structural regulation from the closely confined [BPP]2+ to the incompact [BPPP]2+ matrix, the concentration of the fluorescent [SbCl5]2− species and the CCQ effect were notably diminished, which significantly promoted the localization degree of the photoelectrons. Hence, [BPPP]SbCl5 displays enhanced broadband yellow light emission with a high photoluminescence quantum yield of 79.57%, while [BPP]SbCl5 is completely non-luminescent. In addition, by virtue of the PL inactivation–activation conversion in the superfast assembly process from SbCl3 to [BPPP]SbCl5, secret information encrypted by an invisible printed SbCl3 pattern can be rapidly decrypted by the light-emissive [BPPP]SbCl5 under the trigger of an organic precursor, which showcases the potential in confidential information encryption–decryption technology.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Ming-Jie Zhou,Teng Xu,Ji-Ming Hu
Layered double hydroxide (LDH) films have been used to protect metal substrates because of their superior barrier performance and capability of capturing corrosive anions (such as Cl − ) by exchange with interlayer anions. In this preliminary work, we determined that some photoactive LDHs (such as NiAl-LDH) can also provide cathodic protection to metals under light illumination, stemming from the light-generated electrons of semiconducting LDHs, if the energy level of the conduction band of LDHs is higher than the Fermi level of the metal. The current experimental results prove that the corrosion resistance of stainless steel is enhanced by the attached NiAl-LDH films in the dark and is further increased under light illumination due to photogenerated cathodic protection.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Yichang He,Yiquan Liao,Bin Zhang,Ruiqi Xu,Ye Ma,Minggang Zhao,Hongzhi Cui
Melamine added to milk powder can lead to kidney injury and even death, but rapid detection is still hard due to the strong interference of milk powder solution. Herein, the CC/CeO 2 /CNPs mesh was constructed to detect melamine by using the photo-enhanced barrier effects on electrochemical response. Schottky barrier was regulated effectively to produce electrochemical response to melamine by photo-induced electrostatic interaction, which exhibited strong resistance to interference in milk powder solution. Sensitivity was enhanced by nearly 5 times and the lowest detection limit was reduced as low as 0.274 nM. The obtained high recovery (100%-104%) and good stability in milk powder solution indicated the good potential for practical applications. It provides a new opportunity for achieving strong resistance to interference by using the photo-enhanced barrier driving effect on electrochemical response.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）