ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Kaizheng Gao,Feihua Liu,Fu Lv,Nuomei Li,Man Liu,Ziheng Ye,Minghan Yu,Rui Yin,Chen Zhang,Yuhui Huang,Weiwei Zhao
The rapid development of advanced electronics, hybrid vehicles, etc. has imposed heightened requirements on the performance of polymer dielectrics. However, the energy density (Ue) of polymer dielectrics significantly decreases due to increased leakage current and dielectric loss under high temperatures and high electric fields. Herein, γ phase Ga2O3 (γ-Ga2O3) nanoplates with wide-bandgap (∼4.7 eV) and moderate dielectric constant (∼10.0) were synthesized and incorporated into a polyimide (PI) matrix. The γ-Ga2O3 nanoplates impede charge injection and transport within the nanocomposites under dual trap mechanisms, namely, deep traps introduced by band alignment at the interface between γ-Ga2O3 and PI and the defective spinel structure of γ-Ga2O3 with lattice defects that function as additional charge carrier traps. Additionally, γ-Ga2O3 nanoplates also serve as electron scattering centers and act as electrical barriers; thus, the leakage current and conduction loss get reduced. Consequently, the nanocomposite with 1 wt % γ-Ga2O3 exhibits a discharge energy density of 4.591 J cm–3 and a breakdown strength (Eb) of 501.49 MV m–1 at 150 °C, which are significantly higher than those of commercial biaxially oriented polypropylene (BOPP) at 25 °C. Moreover, the nanocomposite exhibits remarkable cyclic stability over 120,000 cycles with only 1.2% fluctuation. This work provides a semiconductor filler strategy in the design of polymer nanocomposites for capacitive energy storage at high-temperature and high electric field environments.
研究领域:
材料科学
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介电材料
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高分子纳米复合材料
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能源存储
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电子器件
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Dan Liu,Yuxiao Guo,Yawei Yang,Jie Liu,Xingtian Yin,Wenxiu Que
The organic-inorganic halide perovskite (OIHP) materials are becoming promising, but there is still inherent defect-mediated-carrier recombination in hybrid perovskite materials, thus, leading to inefficient power conversion efficiency (PCE). The defect states, which act as the recombination centers, are usually formed during crystallization process . Here, by a hot injection method, Na 2 S ligand exchange is applied to synthesize copper indium selenium quantum dots (CuInSe 2 QDs), which are well dispersed in N,N-dimethylformamide (DMF) and then added into perovskite precursor solution. The resulted QD-in-perovskite structure is found to be beneficial for enlarging grain size, and thus exhibits an improved crystallinity and absorption due to the passivation of trap states. Hence, the perovskite solar cell (PSC) based on the MAPbI 3 -CuInSe 2 QD hybrid film show an improved carrier lifetime from 58.17 ns to 243.23 ns and an enhanced PCE from 16.3% to 18.4% due to higher open-circuit voltage, compared to the cell device based on the pure perovskite film. Additionally, the optimized cell device presents better stability, which can still keep 75% of the initial PCE after 20-day storage. Such a simple Na 2 S ligand exchange to introduce QD into perovskite provides strong potential for preparing other hybrid materials .
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
J. Du,S. Lyu,K. Jiang,D. Huang,J. Li,R. Van Deun,D. Poelman,H. Lin
Persistent luminescent materials containing deep-level traps have attracted extensive research interest in the field of optical information storage due to their unique features of long-lasting emission, energy storage, and controllable photon release upon external stimulations. However, the lack of suitable luminescent materials with deep-level traps is still the bottleneck of such an optical storage application. Herein, we report a series of persistent luminescent materials with reddish-orange emissions and controllable photon release upon thermal stimulation. Through substitution of Sn by Si, more and deeper trap levels are achieved in Sr 2 SnO 4 :Sm 3+ ,Si 4+ phosphors. Moreover, both ultraviolet light and high-energy X-ray irradiations can induce reddish-orange emitting persistent luminescence from the as-synthesized samples. Rewritable optical information storage and readout based on photon trapping and de-trapping processes are demonstrated. Optical information can be handily encoded using a commercially available 365 nm light-emitting diode, and decoded upon thermal stimulation. The Sr 2 SnO 4 :Sm 3+ ,Si 4+ phosphors as presented in this work show a great promise for rewritable optical data storage and information encryption.
研究领域:
材料科学
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光功能材料
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固态化学
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信息存储技术
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发光物理
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Binbin Luo,Yan Guo,Xianli Li,Yonghong Xiao,Xiaochun Huang,Jin Z. Zhang
In this work, Mn2+ has been efficiently and homogeneously doped into two-dimensional (2D) distorted single-layered EA2PbBr4 (EA: ethylammonium) via a reprecipitation method. Both the doped and undoped 2D layered lead halide perovskites (LHPs) were characterized using a combination of X-ray, electron microscopy, and spectroscopy techniques. The Mn2+-doped EA2PbBr4 (EA2PbBr4:Mn2+) shows a 78% photoluminescence (PL) quantum yield (QY) with complete quenching of self-trapped exciton emission because of efficient exciton trapping by defects created by dopants and small activation energy (∼9.8 meV) between the defect states and Mn2+ d states. Compared to the long lifetime (∼1.5 ms) of Mn2+ emission in CsPbCl3, the lifetime in 2D EA2PbBr4 is found to be ∼0.75 ms, resulting from the heavy atom effect. Additionally, the PL QY of Mn2+ emission can be further increased by codoping Zn2+ or Cd2+, which is attributed to a high density of trap states created by codoping, facilitating exciton to Mn2+ energy transfer. These results reveal the key role of trap states in the energy transfer of Mn2+-doped 2D LHPs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 10
·5891-5903
·
IF 2.014
khan Muhammad Zeeshan,Wang Feipeng,Waleed Aashir,Huang Zhengyong,Hassan Muhammad Arshad Shehzad,Khan Asim
In this work, epoxy resin samples incorporated with nano-Al 2 O 3 of various concentrations 0, 1, 3 and 5 wt% were prepared. Surface treatment of nano-Al 2 O 3 was performed by the saline coupling agent of γ-aminopropyltriethoxysilane (KH550) to restrict the aggregation. The thermal gravimetric analysis (TGA) of the epoxy resin/Al 2 O 3 nanocomposites was observed at different filler concentrations. TGA analysis indicated that incorporation of nano-Al 2 O 3 increases the decomposition temperature as compared to pure epoxy resin. Moreover, 3 wt% filler concentration showed increased decomposition temperature because nanoparticles form close connections between molecules due to which thermal stability improved at higher temperatures. Atomic force microscopy was employed for the surface morphology of epoxy resin/Al 2 O 3 nanocomposites which has indicated that surface roughness of epoxy resin/Al 2 O 3 nanocomposites increased slightly with the filler concentration. The distribution of trap energy and trap density obtained by isothermal surface potential decay measurements revealed that 1 wt% filler concentration results in decrease in surface potential decay rate. In addition, significant increase in deep trap energy level and trap density was obvious at 1 wt% filler concentration. AC and DC breakdown strength of the samples was measured to evaluate the effect of filler concentrations on the electrical characteristics of epoxy resin. The results showed that breakdown strength of the epoxy resin/Al 2 O 3 nanocomposites increases with the nano-Al 2 O 3 concentration. Moreover, increase in trap energy results in an increase in the breakdown strength of the nanoparticles.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2014
·
IF 3.193
Liang Wang,Fuxing Xu,Xinhua Dai,Xiang Fang,Chuan-Fan Ding
A mesh-electrode linear ion trap (ME-LIT) mass analyzer was developed and its performance was primarily characterized. In conventional linear ion trap mass analyzers, the trapped ions are mass-selected and then ejected in a radial direction by a slot on a trap electrode. The presence of slots can strongly affect the electric field distribution in the ion trapping region and distort the mass analysis performance. To compensate for detrimental electric field effects, the slot is usually designed and fabricated to be as small as possible, and also has very high mechanical accuracy and symmetry. A ME-LIT with several mesh electrodes was built to compensate for the effects caused by slots. Each mesh electrode was fabricated from a plate electrode with a relatively large slot and the slot was covered with a conductive mesh. Our preliminary experimental results show that the ME-LIT could considerably diminish the detrimental electric field effects caused by slots, and increase the mass resolving power and ion detection efficiency. Even with 4-mm-wide slots, a mass resolution in excess of 600 was obtained using the ME-LIT. Mass resolution could be remarkably improved using mesh electrodes in ion traps with asymmetric electrodes. The stability diagram of the ME-LIT was mapped, and highly efficient tandem mass spectrometry was demonstrated. The ME-LIT was qualified as a LIT mass analyzer. The ME-LIT can improve the mass resolution and decrease the requirements of mechanical accuracy and symmetry of slots, so it shows potential for a wide range of practical uses.
研究领域:
分析化学
·
质谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
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2016
·
IF 2.183
Xinming Huo,Fei Tang,Jin Chen,Xiaohua Zhang,Xiaohao Wang
The rectilinear ion trap (RIT) has always been one of the ideal candidates for mass analyzer miniaturization because of its simple configuration. In this work, the effect of the ejection-slit dimensions on the ion ejection efficiency of a miniature rectilinear ion trap (mRIT) with full-scale dimensions of 5 mm × 4 mm × 25 mm was investigated by using SIMION8.1 simulation. Six mRITs with the same dimensions as those simulated and with different slit widths, whose X electrodes were fabricated by the stainless steel chemical etching process, were tested and characterized on a homemade mass spectrometer platform. It is shown that the ejection slit dimensions have a significant impact on both the signal intensity and mass resolution. For an mRIT with these full-scale dimensions, the optimized slit dimensions are 0.6 mm × 18 mm. The optimized mRIT demonstrated capabilities including a mass/charge range of over 1000 Th, unit mass resolution at m / z 332, and a passable tandem mass spectrometry capability, which are better than the non-optimized RIT with the same dimensions.
研究领域:
分析化学
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仪器科学与技术
✓ 已验证
产品关联
DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2017
·Vol. 31
·期 12
·1031-1040
·
IF 1.998
Xinming Huo,Jin Chen,Fei Tang,Tongtong Yao,Shiyun Piao,Kai Ni,Xiaohao Wang
Rationale Secular frequency scanning is a mass spectrometry (MS) analysis method in which the frequency of the auxiliary alternating current (AC) signal is scanned. It has low requirements for radio-frequency (RF) power, which is beneficial for the miniaturization of the mass spectrometer. In this study, the MS performance in the reverse secular frequency scanning (RSFS) mode is optimized for a rectilinear ion trap (RIT), and a method for rapid MS analysis using continuous secular frequency scanning (CSFS) is proposed. Methods A RIT mass spectrometer with an auxiliary AC frequency scanning function was built. The resolution, tandem mass spectrometry (MS/MS) and quantitation capability in the RSFS mode were characterized and optimized. Operation in the CSFS mode was then performed by scanning the frequency of the auxiliary AC signal continuously and periodically while maintaining the RF signal and the front Z electrode in the ion injection state, so that the ion injection and cooling were performed at the same time as the mass analysis. Results With this system, the RSFS mode achieved unit mass resolution at 332 Th, and the MS/MS analysis was completed without changing the RF amplitude at q = 0.4583 for reserpine. The limit of quantitation for imatinib was about 250 ng/mL with the determination coefficient R 2 = 0.9981. In the CSFS mode, a single analysis cycle of less than 20 ms could be achieved, which is 14 times faster than the traditional sweep modes. In addition, 100% ion utilization can theoretically be achieved in the CSFS mode. Conclusions The CSFS mode is different from the traditional phased sequential operation mode of an ion trap mass spectrometer. By periodic scanning of the auxiliary AC frequency while maintaining ion injection, it is possible to improve the analysis efficiency of the mass spectrometer, which has the prospect of useful application in the field of rapid MS monitoring. Copyright © 2017 John Wiley & Sons, Ltd.
研究领域:
分析化学
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质谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yuanyuan Shao,Chenchen Song,Zeyi Yue,Sheng Peng,Wuduo Zhao,Wenfen Zhang,Shusheng Zhang,Gangfeng Ouyang
Sensitive detection of trace Phthalate esters (PAEs) in ambient air has great significance for environmental supervision and human health. In this research, a sensitive analytical method was established to determine trace PAEs in ambient air by combining the needle trap device (NTD) with gas chromatography-mass spectrometry (GC–MS). The operating parameters were optimized for the PAEs detection. In addition, the preservation capacity and repeatability of the sampling needle were also investigated. Under the optimized conditions of sampling flow rate of 5 mL min -1 , breakthrough volume of 100 mL, desorption temperature of 290 ºC, and desorption time of 150 s, the satisfactory extraction stability (intraday and daily) of PAEs with relative standard deviations (RSDs) was less than 10%, and the average recovery was ranged from 88.89% to 93.77% within seven days. The wide linear concentrations of 0.04 µg L −1 -10 µg L −1 and low detection limits of 0.050–3.6 ng m −3 demonstrated that the established method based on the micro-extraction device of NTD was competitive and had a potential application for trace PAEs in ambient air.
研究领域:
环境科学
·
分析化学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
Nature Electronics
·
2025
·
IF 40.9
Lu Xiuyuan,Deng Yunzhou,He Siyu,Zhu Xitong,Zelewski Szymon J.,Wang Hao,Ren Aobo,Zhou Xiangyu,Wu Jiang,Li Xiang,Zeng Jiejun,Dai Xingliang,Shen Qibin,Chen Desui,Penty Richard V.,Friend Richard H.,Jin Yizheng
Fast-response electroluminescent devices are crucial for optoelectronic applications that involve high-speed operations. Quantum-dot light-emitting diodes are solution-processed electroluminescent devices with high efficiencies and stabilities, and they are of potential use in such applications. However, their response speed is typically limited by slow charge injection and transport across the organic hole-transport layers. We show that the transient electroluminescent responses of quantum-dot light-emitting diodes are influenced by their excitation history in pulsed operations. As the pulse interval decreases, this results in an increased response speed and the emergence of another fast-response electroluminescent channel, indicating the presence of excitation-memory effects. We show that these dynamics are due to deep-level hole traps in the organic hole-transport layers with fast charge-trapping and slow charge-detrapping characteristics. We develop a low-capacitance micro-quantum-dot light-emitting diode that exploits the excitation-memory-induced fast-response channel. The device, which has a −3 dB bandwidth of up to 19 MHz, exhibits an electroluminescent modulation frequency of 100 MHz and data-transmission rates of up to 120 Mbps with sub-picojoule energy consumption.
研究领域:
材料科学
·
光电子学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Guoqiang Zhang,Yangsen Xu,Peixin Zhang,Chuanxin He,Hongwei Mi
Here, lithium ions inserted crystalline carbon nitrides (LCCN) with different defect concentrations are prepared by elaborately regulating the mass transfer process in thermal polymerization. It is revealed that there is no conventional exciton–polarons-induced exciton dissociation mechanism in LCCN due to the weak coupling between excitons and phonons. On the contrary, excitons continue to trap/detrap through defect-induced traps, which weakens the Coulomb force between electron–hole pairs, thereby accelerating exciton dissociation. It is worth emphasizing that this is the first systematic research on the exciton dissociation characteristics and photocatalytic activity of LCCN of poly(heptazine imide) structure. A strategy of assisting exciton dissociation through defect-induced traps to address the inherently high exciton binding energy and low exciton dissociation efficiency issues in polymer photocatalysts is proposed.
研究领域:
材料科学
·
光催化
·
物理化学
·
半导体物理学
✓ 已验证
产品关联
DOI
高影响因子
FREE RADICAL BIOLOGY AND MEDICINE
·
2025
·
IF 8.2
Yunpeng Zhu,Lingjiang Li,Yunshan Guo,Renji Wang,Yiguang Hao,Xin He
The formation of neutrophil extracellular traps (NETs) at the injury site contributes to secondary damage in spinal cord injury (SCI). This study investigated the function of EDIL3 in spinal cord ischemia-reperfusion injury (SCIRI) and its connection to NET formation. We established a mouse SCIRI model, which revealed significant neutrophil infiltration and NET formation within the injured spinal cord at 48 hours post-reperfusion. Therapeutic disruption of NETs with DNase1 or EDIL3 overexpression ameliorated multiple aspects of SCIRI pathology, including tissue damage, blood-spinal cord barrier (BSCB) disruption, neuroinflammation, neuronal death, and motor deficits. Endothelial cell-specific knockout of EDIL3, however, intensified these injuries. Mechanistically, EDIL3 inhibited PMA-induced NET formation in vitro by attenuating NF-κB activation and protected the endothelial barrier from NET-mediated damage in co-culture assays. Moreover, NSUN2 promoted m5C methylation of EDIL3 mRNA, facilitating its YBX1-dependent stabilization. Crucially, the exacerbation of SCIRI following NSUN2 knockdown was abrogated by EDIL3 upregulation. Collectively, the NSUN2-EDIL3 axis represents a key endogenous pathway that limits BSCB disruption and neuronal death in SCIRI by restraining NET formation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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