ACTA PHYSICO-CHIMICA SINICA
·
2014
·Vol. 30
·期 8
·1495-1500
·
IF 0.886
ZHANG Jing-Bo,LI Pan,YANG Hui,ZHAO Fei-Yan,TANG Guang-Shi,SUN Li-Na,LIN Yuan
To improve the light-to-electric conversion efficiency of quantum dots-sensitized nanocrystalline thin-film solar cells, a PbS electrode with high electrocatalytic activity toward polysulfide electrolyte was prepared by successively treating Pb foil in acid and polysulfide solutions.
Electrochemical impedance spectroscopy (EIS) measurements were performed to evaluate the electrocatalytic activity of the prepared PbS electrode. Based on the EIS results, the temperature and time to treat the Pb foil in the acid solution were optimized. The PbS electrode prepared under the
optimized conditions was used as a counter electrode to fabricate a quantumdotssensitized solar cell with a CdSe quantum dots-sensitized TiO2 nanocrystalline thin film as the photoanode and polysulfide solution as the electrolyte. Both the electrocatalytic activity and light-to-electric
conversion properties of the PbS electrode prepared from acid treatment of Pb foil for the optimized temperature and time are superior to those of electrodes prepared by other reported methods. In our method, the treatment time is considerably less but the PbS counter electrode maintains a
superior catalytic activity compared with other methods. X-ray diffraction and scanning electron microscopy were performed to demonstrate the formation process of PbS, and the catalytic enhancement mechanism of the prepared PbS electrode is discussed.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Zeyi Wang,Linqi Chen,Jingzhou Li,Xuting Chen,Xinjie Li,Beier Zhou,Hongxing Dong,Long Zhang
Lead sulfide quantum dots (PbS QDs) offer significant potential for near-infrared (NIR) free-space optical communication (FSOC) due to tunable bandgaps and broad spectral response. However, their microsecond-scale photoluminescence (PL) lifetimes and pronounced Auger recombination critically limit modulation bandwidth and signal-to-noise ratios. Plasmonic nanostructures can address these limitations via the Purcell effect, but the involved lithographic fabrication compromises scalability and precise sub-wavelength structuring. This work presents a facile, lithography-free methodology for dense, vertically aligned gold nanorod (Au NR) arrays with strong localized surface plasmon resonance (LSPR) across the NIR. By combining seed-mediated synthesis of high-aspect-ratio Au NRs (>8) with precise solvent evaporation-induced self-assembly (EISA) on functionalized substrates, vertically oriented arrays are achieved. The integration of vertical and well-aligned Au NR arrays with PbS QD photoconversion layer induces a 769% peak PL intensity enhancement at resonance. Moreover, the Purcell effect from strong near-field confinement accelerates spontaneous emission, reducing the ensemble-average PL lifetime from 860 ns to 279 ns – a critical advance for bandwidth. Within a representative FSOC link employing intensity modulation, the optimized plasmon-enhanced PbS QD photoconversion material achieves a −3 dB bandwidth of 930 kHz and supports 2.0 Mbps on–off keying (OOK) with a bit error rate (BER) of 3.8 × 10⁻ 3 under ambient conditions. This demonstrates a promising improvement over baseline QD devices and validates the efficacy of the EISA-fabricated plasmonic array for high-speed NIR FSOC.
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xiaofang Shen,Zhaoxia Li,Yan Cui,Yuehong Pang
Thiol biomolecule of glutathione (GSH) combined with lead ion as precursor for synthesis of hierarchical PbS via hydrothermal degradation has been developed. The precursor and as-prepared PbS were characterized by Fourier-transform infrared spectra (FTIR), X-ray diffraction (XRD), scanning electronic microscopy (SEM) and electrochemical technique. Flower-shaped micron crystals, submicron-sized spherical particles and dendritic PbS were controllably synthesized by adjusting pH value of the precursor solutions. GSH acted as both soft template and sulfur source in the synthesis. To investigate the suitability of PbS for pesticidal sensing application, an pesticidal biosensor based on the AChE-CHIT/dendritic PbS/GCE has been devised. Organophosphate pesticide dimethoate was selected as model to examine the feasibility of pesticidal bio-sensing. Under the optimum conditions, a quantitative measurement of dimethoate was achieved with the linear range of 0.05 μM to 1.0 μM and the detection limit of 0.02 μM.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Tian Jia,Yuanze Hong,Zhipeng Wei,Baoxia Mu,Xuechao Yu
Near-infrared photoelectric detectors are widely used in the military and national economy, such as aerospace, optical communication, and near-infrared imaging. Graphene/quantum dots (QDs) hybrid photodetectors possessing high responsivity and broadband spectral range have been prodigiously studied due to the combination of high mobility of graphene, broad spectral response, and high light absorption of QDs. However, the long-chain ligands that modify the outer surface of the QDs stem the transfer of charge carriers, thus hindering the performance of the hybrid photodetectors. Here, we demonstrate colossal response in Graphene/QDs detectors via a two-step ligand exchange method to exchange the inceptive long chains with specifically selected molecules. Prior to the solid-state ligand exchange, QDs were pretreated with methylammonium iodide (MAI) in solution as the first ligand exchange and 1,2-ethanedithiol (EDT) was redeposited after the tetrabutylammonium iodide (TBAI) ligand exchange in the second step to ensure complete passivation of surface defects. After the two-step ligand exchange process, the device performances have been significantly improved. The responsivity and detectivity of the device are 6.7 × 103 A·W–1and 1.86 × 109 Jones, respectively, which are increased by 2 orders of magnitude, heralding the development of high-performance near-infrared photodetection and imaging systems in integrated photonics applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Micromachines
·
2022
·Vol. 13
·期 3
·443
·
IF 3.523
Nur Diyana Halim,Muhammad Safwan Zaini,Zainal Abidin Talib,Josephine Ying Chyi Liew,Mazliana Ahmad Kamarudin
The temperature dependence of photoluminescence (PL) emission is a valuable tool for investigating carrier localization, recombination, and carrier–phonon interactions. Herein, electron–phonon couplings in lead sulfide (PbS) quantum dots (QDs) and lead sulfide/manganese tellurite (PbS/MnTe) QDs is reported. The effect of temperature on the PL emission of PbS and PbS/MnTe was explored within a temperature range of 10 to 300 K. When temperature increased, PL emission was blue-shifted due to the confinement effect. The gradual broadening of the full width at half maximum (FWHM) with increasing temperature indicates electron–phonon interactions. An analysis based on the Boson model revealed that the values of the exciton acoustic phonon coupling coefficient, σ, and temperature-dependent linewidth, γ, for PbS/MnTe were larger than those for PbS, indicating stronger exciton longitudinal-optical–phonon coupling in the compound structure.Keywords:electron–phonon coupling;confinement;photoluminescence;quantum dots
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Photonics
·
2017
·
IF 6.756
Haiting Zhang,Yating Zhang,Xiaoxian Song,Yu Yu,Mingxuan Cao,Yongli Che,Zhang Zhang,Haitao Dai,Junbo Yang,Guizhong Zhang,Jianquan Yao
We fabricated a vertical field effect phototransistor with Au/Ag nanowires as the transparent source electrode and with vertically stacked layers of poly(3-hexylthiophene) (120 nm) and lead sulfide quantum dots (380 nm), which formed heterojunctions. The built-in electric field in the layered heterojunction aids the separation of photoinduced excitons, while the short channel enables efficient carrier transport across the active region. Both of these benefits enable a high photoperformance and fast photoresponse. This vertical phototransistor can be operated at room temperature with a low operation voltage of −1 V and is therefore energy-efficient. Further, it has a wide response spectrum from 400 to 2100 nm, a high photoresponsivity of more than 9 × 104 AW–1, and a high detectivity of up to 2 × 1013 Jones (cm Hz1/2 W–1) under infrared illumination. Additionally, this vertical phototransistor had a response time of 9 ms, which is faster than a previously reported lateral field effect phototransistor based on poly(3-hexylthiophene)/lead sulfide quantum dots. The vertical architecture combined with the layered heterojunction approach provides a new, facile way of fabricating high performance devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 8
·5087-5094
·
IF 3.531
Hongbo Hou,Zejun Pu,Xu Wang,Rongli Zhu,Xianyong Li,Jiachun Zhong
In this study, WPU@SiO 2 nanoparticles were obtained by grafting waterborne polyurethane (WPU) on the surface of silicon dioxide (SiO 2 ). Then, WPU@SiO 2 nanoparticles were introduced into the matrix of polybutylene succinate (PBS) to prepare a series of PBS/WPU@SiO 2 composites. The dispersibility and interfacial compatibility of filler and matrix can be improved obviously by grafting a layer of WPU onto the surface of SiO 2 nanoparticles. The FTIR and TGA results showed that WPU was successfully grafted onto the surface of SiO 2 . According to polarizing microscope images, it is clear that the size of the pure PBS crystals is much larger than that of the PBS/WPU@SiO 2 , and a large number of crystals are evenly distributed in the PBS/WPU@SiO 2 composite. In addition, DSC and TGA results indicated that PBS/WPU@SiO 2 composite films show excellent thermal properties. Meanwhile, the initial thermal decomposition temperature of PBS/WPU@SiO 2 composite films is about 366–374°C. For the 10 wt% WPU@SiO 2 reinforced PBS-based composite films, the tensile strength reached the ultimate value (38.49 MPa), which is 32.04% higher than that of pure PBS. Based on its excellent mechanical and thermal properties, the PBS/WPU@SiO 2 composites have a broad application prospect in the field of biodegradable materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2023
·
IF 3.2
Xiaoming Zhou,Junwei Wu,Dongdong Yu
Based on the stress fluctuation during the tensile process of poly(butylene succinate) (PBS), the tensile behavior of biodegradable bicrystalline block copolyesters (PBSEG) synthesized using polycondensation of poly(ethylene glycol) (PEG) and poly(butylene succinate) (PBS) was further studied. The effects of tensile rate and temperature test conditions on the stress–strain behavior of bicrystalline block copolymer PBSEG were investigated by conducting tensile tests. The experimental results showed that when the mass content of polyethylene glycol in PBSEG was 60%, the material did not show obvious periodic stress fluctuation during the “cold drawing” stage of the stress–strain curve, but showed different and more complicated periodic curve changes. The stress fluctuation of PBSEG copolyester had the characteristics of small amplitude and short period. The elongation at break increased obviously, and the maximum elongation at break was more than 2000%. The analysis of morphology and structure showed that the surface morphology of PBSEG dumbbell bars did not show obvious alternating changes in structure, characterized by light and dark. Craze was the main cause of ductile fracture for PBS and PBSEG copolyesters. The tensile fracture of the two materials occurred in the stress fluctuation region. Highlights Small-amplitude and short-period stress fluctuation for PBSEG copolyester. There was no alternating light and dark on the surface of the PBSEG stretched spline. Craze was the main cause of ductile fracture for PBS and PBSEG copolyesters. Tensile fracture of the materials occurred in the stress fluctuation region.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Xiaoliang Li,Zhenxin Yang,Zheng Liang,Pengyan Luan,Nan Chen,Xuanhe Li,Jiale Su,Fushun Li,Dongming Zhang,Deng-Ke Wang,Zheng-Hong Lu,Qiang Zhu
Lead sulfide (PbS) colloidal quantum dots (CQDs) have exhibited significant potential in the fabrication of near-infrared photodetectors owing to their robust and adjustable absorption. However, the high density of surface states in PbS CQDs exacerbates their intrinsic photocarrier dynamics, such as increased photocarrier recombination and charge trapping, thereby resulting in low detectivity, slow response speed, and heightened noise of devices. To achieve high-performance PbS-CQD photodetectors, this study focuses on optimizing the photocarrier dynamics through materials and device fabrication techniques such as surface engineering, energy band engineering, and device structures. The PbS CQDs were synthesized via hot injection, while the thin-film devices were fabricated through spin-coating followed by solid-state ligand exchange. Different ligands were employed to modulate the charge carrier transport, surficial defect states, and energy band structures of the PbS-CQD films. By managing energy band structures, bilayer PbS-CQD films with type-II heterojunctions were fabricated to elucidate the role of heterojunctions in photocarrier separation and device performance. Two types of device structures, photoconductors and phototransistors, were explored for their applications as photodetectors while studying their operation mechanisms. A theoretical analysis was conducted on photocarrier dynamics within these devices by a comprehensive comparative investigation on electronic characteristics of PbS-CQD films such as defect states, conductance, and energy band alignments at heterojunctions along with device performances including 1/f noise behavior, sensitivity, responsivity, detectivity, and operation speed. The experimental findings, combined with theoretical insights from this study, serve as essential references for optimizing material selection and designing efficient devices for photodetection based on PbS-CQDs.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xue Liu,Jianguo Deng,Fuhan Mai,Xin Li,Guohong Pu,Zhihua Deng,Lanxiang Ji,Xiaofeng Bai,Quanping Zhang,Yuanlin Zhou
The development of multifunctional radiation protection materials is crucial to ensure the safety of personnel and equipment in complex nuclear environments. Herein, a flexible radiation protection material integrating self-healing, thermal management, and behaviour response was prepared from Ta 4 C 3 T x MXene, Hydrogen-terminated phenyl polysiloxane, and Polyborosiloxane through esterification, “thiol-ene click” hydrosilylation reaction using L(+)-Cysteine as a bridge. The results showed that when Ta 4 C 3 T x MXene reached 20 wt%, the tensile strength of composite was 0.6321 MPa with the self-healing rate at 90.22 %. And the gauge factor of the material reached 25.83 at 100 % strain. This compensated for the gap between low strain and high sensitivity. Additionally, the multilayer structure of Ta 4 C 3 T x MXene and the absorption properties of Tantalum enable the material to attenuate γ-rays through absorption and scattering mechanisms. The attenuation capability of Ta 2 O 5 and Ta 4 C 3 T x MXene fillers for 59.6 KeV γ-rays was compared at the same Tantalum content. When the Tantalum content reaches 23.81 wt%, the Ta 4 C 3 T x MXene composite contains 20 wt% filler and has an attenuation coefficient of 0.757. Similarly, the Ta 2 O 5 composite contains 22.5 wt% filler and has an attenuation coefficient of 0.734. These results are significant for improving temperature and behaviour monitoring of workers in low-temperature nuclear environments.
研究领域:
材料科学
·
核工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Xiaoming Zhou,Tonghao Wu
Two novel phosphorus-containing copolyesters were synthesized by direct polycondensation reaction of phenyl dichlorophosphate, 1,4-succinic acid and 1,4-butanediol using stannous chloride (SnCl 2 ) and 4-Methylbenzenesulfonic acid as catalyst, and its chemical structures were identified by 1 H and 31 P nuclear magnetic resonances ( 1 H and 31 P NMR). The resulting phosphorus-containing poly(butylene succinate) (PPBS) was characterized by X-ray diffraction (XRD), polarized optical microscope (POM), thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC). PPBS can be as a flame retardant for commercial poly(butylene succinate) (PBS). A series of flame retardant composite materials were produced by melt-blending of PBS and PPBS. The comprehensive flame retardant property of composite materials was evaluated by limited oxygen index (LOI). While 20 wt % of PPBS was added into PBS resin, good flame retardant properties could be obtained. Composite materials can have much better flame retardancy (LOI = 30) than neat PBS resin. Thermogravimetric analysis (TGA) showed that the weight loss of PBS was decreased by the introduction of PPBS. In addition, possible flame retardancy mechanism of PPBS in composite materials was analyzed by SEM photos of char residue.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-12
·
IF 12.264
Yang Xiaokun,Yang Ji,Khan Jahangeer,Deng Hui,Yuan Shengjie,Zhang Jian,Xia Yong,Deng Feng,Zhou Xue,Umar Farooq,Jin Zhixin,Song Haisheng,Cheng Chun,Sabry Mohamed,Tang Jiang
The hydroiodic acid was explored systematically to modify PbS quantum dots (QDs) ink process, which could remove trap states by hydroxyl ligand and improve iodine passivation on the PbS-QDs surface.
This strategy solved the essential question of PbS-QDs ink process and showed the favorable application prospects in QDs technology.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）