Catalysts
·
2019
·Vol. 9
·期 12
·1067
·
IF 3.444
Zheng Ma,Xiumin Ma,Xiutong Wang,Nazhen Liu,Xuehui Liu,Baorong Hou
In this work, the photo-catalytic activity of TiO2is considerably enhanced via sensitization with CdIn2S4, and its application for protecting Q235 from corrosion in splash zones is examined. TiO2nanotube arrays (NTAs) are prepared on a flat Ti substrate via two-step anodization. CdIn2S4 is deposited on the surface of TiO2NTAs by hydrothermal reaction. TiO2NTAs with enormous specific surface areas and large-diameter hollow nanostructures are found to benefit the immobilization of CdIn2S4. As a narrow band gap semiconductor, CdIn2S4is able to extend the light absorption range of TiO2, and the construction of an n–n type hetero-junction accelerates the separation of carriers. Strong solar light, which accelerates the corrosion of Q235 in the splash zone area, is converted into the necessary condition for protecting Q235 from corrosion. In this work, TiO2is sensitized with MoS2microspheres (MoS2/TiO2nanocomposites), which were prepared on a flat Ti substrate via a two-step anodization and hydrothermal method, sequentially.Keywords:corrosion;photocathodic protection;visible light;narrow bandgap semiconductor;TiO2
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2019
·
IF 13.903
Mingxing Zhao,Wei Xia,Yang Wang,Man Luo,Zhen Tian,Yanfeng Guo,Weida Hu,Jiamin Xue
Two-dimensional (2D) materials with narrow band gaps (∼0.3 eV) are of great importance for realizing ambipolar transistors and mid-infrared (MIR) detections. However, most of the 2D materials studied to date have band gaps that are too large. A few of the materials with suitable band gaps are not stable under ambient conditions. In this study, the layered Nb2SiTe4 is shown to be a stable 2D material with a band gap of 0.39 eV. Field-effect transistors based on few-layer Nb2SiTe4 show ambipolar transport with a similar magnitude of electron and hole current and a high charge-carrier mobility of ∼100 cm2 V–1 s–1 at room temperature. Optoelectronic measurements of the devices show clear response to an MIR wavelength of 3.1 μm with a high responsivity of ∼0.66 AW–1. These results establish Nb2SiTe4 as a good candidate for ambipolar devices and MIR detection.
研究领域:
材料科学
·
电子工程
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CURRENT APPLIED PHYSICS
·
2012
·
IF 1.9
Peisong Tang,Yi Tong,Haifeng Chen,Feng Cao,Guoxiang Pan
Single phase perovskite LaFeO 3 nanoparticles are directly synthesized by a one-step microwave-assisted route without additional high temperature calcination process. The prepared sample is characterized by X-ray diffraction (XRD), field emission scanning microscope (FE-SEM), Brunauer–Emmett–Teller (BET) specific surface area measurement, diffuse reflectance spectroscopy (DRS) and Fourier transform infrared spectroscopy (FTIR). XRD and SEM show that the prepared LaFeO 3 is single phase perovskite and sphere-like shape. The DRS result shows that the prepared LaFeO 3 has strong visible-light absorption and an optical absorption onset of 525 nm, corresponding to an optical band gap of 2.36 eV. The photocatalytic experiment demonstrates that LaFeO 3 is highly visible-light photocatalytic active for the degradation of methylene blue. It is suggested that the narrow band gap and the strong visible-light absorption are responsible for the high visible-light photocatalytic activity of the prepared LaFeO 3 .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 24
·e202201616
·
IF 9.14
Jian Zhang,Gui Ye,Chao Zhang,Zhiming Pan,Sibo Wang,Guigang Zhang,Xinchen Wang
Graphical Mind the gap : A narrow-bandgap poly(heptazine imide) (PHI) semiconductor with ordered-distorted interface that captures solar spectrum up to 650 nm presents enhanced visible-light photocatalytic hydrogen production. The apparent quantum yield reaches 20 % for hydrogen production at 450 nm Poly(heptazine imide) (PHI), one of the attractive allotropes of polymeric carbon nitride, has recently received extensive attention in photocatalysis due to its extended conjugation for fast separation and transfer of the charges. However, pristine PHI bears an intrinsic optical absorption band edge at 460 nm, which largely restrains the visible light utilization. Herein, the narrow-bandgap PHI (N-PHI) with an ordered-distorted interface was fabricated from polycondensation of the mixture of NaSCN, cyanuric chloride, and LiCl. Results revealed that the enhanced optical absorption and the promoted separation and transfer of the charge carriers at the interface greatly improved the photocatalytic performance, which endowed N-PHI with an apparent quantum yield of 20 % for hydrogen production at 450 nm.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Yongping Dai,Qiang Yu,Xiaoxin Yang,Kun Guo,Yan Zhang,Yushuang Zhang,Junrong Zhang,Jie Li,Jie Chen,Haiqin Deng,Tianhao Xian,Xiao Wang,Jian Wu,Kai Zhang
Ultrafast photonics has become an interdisciplinary topic of great consequence due to the spectacular progress of compact and efficient ultrafast pulse generation. Wide spectrum bandwidth is the key element for ultrafast pulse generation due to the Fourier transform limitation. Herein, monoclinic Nb2GeTe4, an emerging class of ternary narrow-gap semiconductors, was used as a real saturable absorber (SA), which manifests superior wide-range optical absorption. The crystallization form and growth mechanism of Nb2GeTe4 were revealed by a thermodynamic phase diagram. Furthermore, the Nb2GeTe4–SA showed reliable saturation intensity and larger modulation depth, ascribed to a built-in electric field driven by the asymmetric crystal architecture confirmed via X-ray diffraction, polarized Raman spectra, and scanning transmission electron microscopy. Based on the Nb2GeTe4–SA, femtosecond mode-locked operation with good overall performance was achieved by a properly designed ring cavity. These results suggest that Nb2GeTe4 shows great promise for ultrafast photonic applications and arouse interests in exploring the intriguing properties of the ternary van der Waals material family.
研究领域:
材料科学
·
光学工程
·
物理学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 32
·2301125
·
IF 29.4
Lishuai Huang,Hongsen Cui,Wenjun Zhang,Dexin Pu,Guojun Zeng,Yongjie Liu,Shun Zhou,Chen Wang,Jin Zhou,Cheng Wang,Hongling Guan,Weicheng Shen,Guang Li,Ti Wang,Wenwen Zheng,Guojia Fang,Weijun Ke
Narrow-bandgap (NBG) mixed tin/lead-based (Sn-Pb) perovskite solar cells (PSCs) have attracted extensive attention for use in tandem solar cells. However, they are still plagued by serious carrier recombination due to inferior film properties resulting from the alloying of Sn with Pb elements, which leads to p-type self-doping behaviors. This work reports an effective tin oxide (SnO x ) doping strategy to produce high-quality Sn-Pb perovskite films for utilization in efficient single-junction and tandem PSCs. SnO x can be naturally oxidized from tin diiodide raw powders and successfully incorporated into Sn-Pb perovskite films. Consequently, Sn-Pb perovskite films doped with SnO x exhibit dramatically improved morphology, crystallization, absorption, and more interestingly, upward-shifted Fermi levels. The resulting narrow-bandgap Sn-Pb PSCs with natural SnO x doping have considerably reduced carrier recombination, therefore delivering a maximum power conversion efficiency (PCE) of 22.16% for single-junction cells and a remarkable PCE of 26.01% (with a steady-state efficiency of 25.33%) for two-terminal all-perovskite tandem cells. This work introduces a facile doping strategy for the manufacture of efficient single-junction narrow-bandgap PSCs and their tandem solar cells.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Yanjun Duan,Bingxin Yang,Yujiao Ma,Chao Gao,Shengren Li,Lin Yang,Zhiqiang Li
High-quality photodetectors are essential for getting external information, especially those operating in the near-infrared range. These devices play a critical role in remote communication systems by effectively converting light into electronic signals effectively. The emerging copper-based chalcogenides have attracted attention for thin film solar cells and self-powered photodetectors. However, they can detect only certain wavelengths of infrared light because of their wide bandgaps. In this work, we prepared a hexahydroxy chalcogenide copper–cadmium-zinc–tin sulfur–selenium (CCZTS) absorber with a narrow bandgap of 0.87 eV. Then, we developed a self-powered CCZTS/cadmium sulfide (CdS) thin film photodetector. Furthermore, the manganese (Mn2+) dopant is incorporated into the CdS buffer layer to improve the heterojunction interface properties. As a result, the devices based on the CCZTS/CdS:Mn heterojunction exhibit high responsivity, reduced dark current, and a fast response speed in the wavelength range of 300–1550 nm. At 1319 nm, it has a responsivity of 0.96 A W–1, a detectivity of 3.79 × 1012 Jones. In addition, the resulting CCZTS-based photodetector is successfully integrated into an optical communication system as an optical signal receiver. Our results demonstrate that it has a significant potential for low-cost infrared photodetection and optical communications.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Haotian Tan,Wei Peng,Tao Zhang,Yonghuan Han,Lichang Yin,Wenping Si,Ji Liang,Feng Hou
Polymeric carbon nitride photocatalyst has attracted much attention due to its visible light response and high chemical stability. However, bulk carbon nitride has a wide band gap and low polymerization, limiting its photocatalytic performance for water splitting. Synthesizing highly polymerized carbon nitride with a narrow band gap still remains challenging. Herein, we propose an ionothermal protocol using supramolecular precursors to fabricate highly polymerized wine-red carbon nitride (WRCN) nanosheets. Both theoretical and experimental investigations revealed that the supramolecular precursor with a high C:N ratio leads to an upward shift of the valence band edge, while the ionothermal synthesis promotes a high polymerization degree, leading to a narrow band gap of 1.82 eV for WRCN. Benefiting from enhanced light absorption and charge separation efficiency, WRCN-loaded hematite photoanode exhibits a much higher photocurrent density than both pristine hematite and bulk carbon nitride decorated hematite. This work may provide a novel strategy to manipulate the electronic structures of carbon nitrides for enhanced photoelectrochemical performances.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chen Yang,Donglei Bu,Shaoming Huang
Due to large band gap and low charge delocalization, hexagonal boron nitride (h-BN) is usually used as catalytic support rather than catalyst, particularly photocatalyst for hydrogen evolution. Herein, three-dimensional porous BN microbeads assembled by 2D BN nanosheets with enriched defects and high specific surface area have been synthesized by solvent-free strategy, leading to multiply narrow band gaps and radical-contained OB 3 structure. Mott-Schottky test indicates that the as-fabricated porous BN is a n-type semiconductor. The narrowed band gaps together with radicals enhance the light absorption and electron delocalization which is further confirmed by Density Functional Theory (DFT) calculation, resulting in the change of BN from a photocatalytic inert to highly active material. This work not only provides a stable and effective BN-based photocatalyst but also benefits to design and develop more highly efficient two-dimensional photocatalysts for hydrogen evolution.
研究领域:
材料科学
·
催化
·
光催化
·
能源材料
·
半导体物理
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Xiaobin Zou,Fei Tian,Haikuan Liang,Yan Li,Yong Sun,Chengxin Wang
Characteristics like air-stability and high carrier mobility make non-van-der-Waals layered Bi2O2Se a good prospect for planar integrated nanosystems. However, experimental investigation about its analogue Bi2O2Te is rather rare due to difficulty in synthesis. Herein, a low-pressure CVD process is proposed that is adjusted to the rigorous growth condition required, with large-scale Bi2O2Te ultrathin film obtained. Magneto-transport behavior reveals a very large anisotropic nonsaturating low-temperature magnetoresistance (∼1133% under 9 T magnetic field). Despite the contradiction between high conductivity and ferroelectricity in principle (mobile electrons screen electrostatic forces between ions), the high-conductive Bi2O2Te film here is revealed experimentally as another intrinsic ferroelectric with the polarization switchable by external electric field (predicted in Nano Lett.2017, 17, 6309). These results prove that Bi2O2Te possesses a very narrow bandgap (∼0.15 eV), high conductivity, large magnetoresistance, and room-temperature ferroelectricity, displaying great potential as a high-performance nanoelectronic two-dimensional semiconductor and, in advanced functional devices, working in the mid-infrared region.
研究领域:
材料科学
·
凝聚态物理
·
纳米电子学
·
铁电材料
·
磁输运
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2020
·Vol. 29
·期 5
·1172-1182
·
IF 2.522
Zhai Mengjiao,Liu Yi,Huang Jing,Hou Wenjia,Wu Songze,Zhang Botao,Li Hua
Abstract A novel TiO 2 -SrCO 3 co-catalyst with a porous structure was fabricated by suspension plasma spraying. SrTiO 3 as revealed by high-resolution TEM was formed by the chemical reaction of TiO 2 with SrCO 3 during the high-temperature plasma spraying. A narrow band gap (2.58 eV) and reduction in the recombination speed of photoinduced carriers of the coatings were detected by UV–visible diffuse reflectance spectrometry and fluorescence spectrometry, respectively. The enhanced visible light-driven photodegradation properties of the coatings resulted in promoted degradation of methylene blue. The composite coatings also demonstrated significantly pronounced bactericidal activities against the Gram-negative bacterium Escherichia coli than the pure TiO 2 coatings, achieving a killing rate of over 99.7%. The results give insights on the potential to fabricate large-scale nano-TiO 2 -based porous photocatalytic coatings by suspension plasma spraying for versatile environmental applications. Graphic Abstract
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Mengnan Yang,Zhenqiang Wang,Tao Ding,Jia Tang,Xiyue Xie,Yuxin Xing,Lu Wang,Jixi Zhang,Kaiyong Cai
Nanoquencher-based biosensors have emerged as powerful tools for the detection of tumor markers, where challenges in efficiently docking the π-electron interaction interface toward nucleic acid probes containing π-electron-rich units of bases and fluorescent dyes still remain. Herein, we present hybrid polydopamine/polypyrrole nanosheets (PDA-PPy-NS) with π electron coupling and ultranarrow band gap (0.29 eV) by interfacial engineering of polymer hybrids at the nanoscale. PDA-PPy-NS were first prepared through oxidant-induced polymerization of pyrrole on PDA nanosheets. By utilizing fluorescent-dye-labeled single-stranded DNA as a probe, the hybrid nanoquencher showed ultrahigh fluorescence quenching ability, i.e., a Cy5-ssDNA/nanoquencher mass ratio of 36.9 under the complete quenching condition, which is comparable to that of graphene oxide. It was demonstrated that the energy level coupling of nanosheets and nucleic acid dye (Cy5) was the key factor contributing to the efficient photoinduced electron transfer (PET). Subsequently, the nanoquencher/DNA probe was proved to possess superior sensitivity and selectivity for efficient and reliable detection of miRNA-21 with a detection limit of 23.1 pM. Our work proves that the π-electron-rich biosensor interface can significantly enhance the PET efficiency, providing a theoretical basis for developing novel high-performance sensors.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
分析化学
·
分子生物学
✓ 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）