ACS Applied Nano Materials
·
2024
·
IF 5.3
Haixia Xie,Cong Zhang,Jie Xu,Yong Pan,Xingtian Yin
PbS quantum dots have demonstrated potential as cost-effective materials for near-infrared photodetectors. Nevertheless, the performance of single-layer PbS quantum dot photodetectors remains unsatisfactory due to the low carrier mobility and high defect state concentration of colloidal quantum dot thin films. In this article, PbS quantum dot films are employed as the sensitizing layers for a-IGZO-based field-effect transistors (FET), which are able to achieve a low dark current and relatively high photocurrent simultaneously when working in the Poole–Frenkel emission region. The as prepared device shows a high responsivity of 25.89 A/W and detectivity of 2.46 × 1012 Jones, but very slow response speed with a decay time of 554 ms, which should be attributed to the high trap density in the PbS quantum dots film. Thus, we proposed a rapid annealing oxidation process to passivate the defects. As a result, after annealing in air at 100 °C for 10 min, the response speed of the device is significantly improved, and the decay time is as short as 2.5 ms, only at the expense of some responsivity and selectivity loss. However, further increasing the annealing temperature leads to excessive photocurrent loss and even affects the response speed improvement.
研究领域:
材料科学
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电子工程
·
光电器件
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6885-6893
·
IF 2.047
Song Angang,Cao Guoqin,Zhu Di,Zhao Baofeng,Fu Zhenya,Cao Shuaiqi,Wang Qingjie,Hu Junhua
Nb-doped TiO 2 (NTO) thin films were sputtered on glass substrate followed by a simple annealing process in air. The photoelectric cooperative optimization was discussed based on the structural, optical and electrical characteristics. The influence of oxygen flow during deposition on materials chemistry and performance was analyzed. Hall measurement showed a strong dependence of transparent conductivity on the oxygen flow. Oxygen vacancies are related to the phase transitions from the rutile to anatase TiO 2 during annealing. The chemical states of Nb, Ti and O before and after annealing were discussed. The achievement of optimized transparent conductivity was resultant from the fine-tuning of the doped chemistry and special interplay of dopants and host lattice. Graphical
研究领域:
材料科学
·
薄膜技术
·
固体物理
·
光电材料
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无机非金属材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 24
·8414-8424
·
IF 4
Tao Tan,Ran Pang,Shangwei Wang,Haiyan Wu,Jiutian Wang,Su Zhang,Chengyu Li,Hongjie Zhang
Cr3+-activated phosphors with high quantum efficiency show excellent promise in the field of near-infrared (NIR) phosphor converted light-emitting diodes (pc-LEDs). Here, we design an annealing program for Cr3+-doped phosphors containing variable valence elements that cannot be prepared in a reducing atmosphere to enhance their luminescence efficiency and thermal stability. A novel phosphor, Li2Mg3SnO6:Cr3+, developed by this annealing design, containing variable valence element Sn, exhibits higher quantum efficiency and better thermal stability than the one prepared by the conventional solid-state reaction. The Li2Mg3SnO6:0.03Cr3+ sample exhibits broadband NIR emission with a full width at half-maximum (FWHM) of 201 nm. After annealing, the internal quantum efficiency (IQE) and external quantum efficiency (EQE) of the Li2Mg3SnO6:0.03Cr3+ sample are enhanced from 48.5% to 84.7% and from 22.7% to 32.6%, respectively, and the thermal quenching temperature at which the luminescence intensity of the phosphor reduces to half of its initial value is promoted from ∼400 K to ∼425 K. The luminescence intensity of the optimized Li2Mg3SnO6:0.03Cr3+ sample at 425 K (∼152 °C) remains 49.2% of its initial intensity at 300 K. A NIR pc-LED is fabricated by combining the optimized Li2Mg3SnO6:0.03Cr3+ sample with a blue LED (455 nm blue chip), and the NIR radiant fluxes of 3.676 mW (at 10 mA) and 29.21 mW (at 100 mA), as well as a maximum NIR photoelectric efficiency of 14.2%, are obtained. The results show that this novel phosphor has great application potential in NIR pc-LEDs, and the annealing design exhibits huge potential for improving the optical properties of Cr3+-activated phosphors.
研究领域:
材料科学
·
光学工程
·
固体物理
·
光电子学
·
无机化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yao Zhu,Huan Yi,Qiaoyan Hao,Jidong Liu,Yuxuan Ke,Zhuo Wang,Dianyuan Fan,Wen jing Zhang
Monolayer WS 2 (1L-WS 2 ) possesses direct band gap, which is beneficial for light emitting applications. However, high quality sample obtained via mechanical exfoliation suffers from ultralow yield of large flakes while large 2D material monolayers synthesized by chemical vapour deposition (CVD) unintentionally induce many defects, resulting in low photoluminescence (PL) intensity. Herein, we firstly control the 1L-WS 2 scalable growth through H 2 introduction at the beginning of the CVD synthesis. Its domain size can be increased from 1 μm up to 20 μm with higher coverage, compared to that synthesized without H 2 introduction. Then, we propose scalable ways to anneal the obtained large 1L-WS 2 in Ar diluted hydrogen sulfide (H 2 S) atmosphere at 750 °C or to treat it with (3-mercaptopropyl) trimethoxysilane (MPS). Its PL intensity can be increased to 12 times by H 2 S or more interestingly to 30 times by MPS, respectively. Our systematic analyses show that the drastic PL improvements are mainly attributed to the reduction of structural defects by H 2 S and MPS, which is facilitated via the H– bond in them. The results help to explore routes to obtaining large-size single crystalline transition metal dichalcogenides monolayer (1L-TMDCs) and intense PL emission.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
表面科学
·
半导体材料
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2022
·
IF 4.931
Ying Chen,Jie Li,Jiawei Lu,Meng Ding,Yi Chen
PVA hydrogels with high strength and toughness are fabricated by dual physical and chemical cross-linking. The best comprehensive mechanical properties can be achieved by reaction at room temperature followed with freeze-thaw and annealing treatment. Besides, the mechanical properties of PVA hydrogel increased first and then decreased with the increase of molecular weight or mass fraction. By changing the reaction solvent, the mechanical properties of PVA hydrogel could also be effectively adjusted. Therefore, the influences of various factors on the mechanical properties of PVA hydrogel can be obtained.
研究领域:
生物材料
·
高分子科学
·
组织工程
·
生物医学工程
·
软物质物理
·
药物递送系统
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yanhua Li,Shuhuan Wang,Kuo Zhang,Dongjia Wang,Qun Li,Yuekai Xue
Herein, the N-doped Ti 3 C 2 /TiO 2 nanostructure has been synthesized via hydrothermal treatment and following annealing in NH 3 . TiO 2 nanoparticles in-situ grow on the surface of Ti 3 C 2 spontaneously, resulting in the stable electron transport between TiO 2 and Ti 3 C 2 . Besides, Ti 3 C 2 nanosheets as conductive substrates make up for the poor conductivity of TiO 2 . The doping of N in Ti 3 C 2 /TiO 2 composite further improves the electrical conduction. The ultimate N-doped Ti 3 C 2 /TiO 2 composite achieves a higher specific capacitance of 737.4 F g −1 than Ti 3 C 2 (324.4 F g −1 ) at 0.5 A g −1 . More importantly, the composite displays a high specific capacitance retention of 81 % over 12,000 cycles. Besides, the assembled symmetrical supercapacitor (SSC) manifests an excellent specific capacitance of 236.4 F g −1 at 1 A g −1 and a comparable energy density of 32.8 Wh kg −1 at the power density of 500 W kg −1 . This work provides promising guidance for the fabrication of durable electrodes for energy storage application.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
·
表面工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Zhanhui Gan,Deyu Kong,Qianqian Yu,Yifan Jia,Xue-Hui Dong,Linge Wang
Research on superhydrophobic surfaces received continued attention due to more and more widely applications of superhydrophobic materials. Two parameters have been recognized for the rational design of the superhydrophobic materials: surface texture and chemical constitution. In this work, we fabricated composite membranes of polystyrene- block -poly (ethylene- co -butylene)- block -polystyrene (SEBS) and fluorinated polyhedral oligomeric silsesquioxane- block -polystyrene (FPOSS-PS) using a sequential electrospinning and electrospraying approach. Composite membranes with hierarchical geometries could be achieved by adjusting the formulation and/or fabrication protocols. Incorporation of fluorinated component enhances the surface property of the composite membranes due to its ultra-low surface energy, while micron particles attached on the surface further promotes the robustness of the membrane and enhanced the cell/tissue anti-adhesion efficiency. With a simple annealing treatment, the physical crosslinking was built up between the micron particles and underlying fibers, rendering the membranes with good stability and anti-adhesion properties. These superhydrophobic membranes are anticipated to have potential applications in wound-dressing and other related areas.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
表面工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2019
·
IF 7.329
Xin Liu,Yequan Xiao,Qiugui Zeng,Jiexuan Jiang,Yanbo Li
Organic-free perovskite solar cells (PSCs) have been considered as the most promising candidate for achieving long-term stability. Here, we demonstrate an organic-free PSC consisting of inorganic CsPbI2Br perovskite, nickel oxide hole transport layer, and niobium oxide electron transport layer. A maximum power conversion efficiency (PCE) of 11.20% is achieved with an active area of 5 cm2, and it increases to 14.11% with smaller area. More importantly, the organic-free PSCs show excellent thermal stability with PCE remaining above 98% of its initial value when heated at 100 °C for 150 min. Postannealing at a proper temperature further increases its maximum PCE to 14.45%, which is the highest among any reported all-inorganic PSCs with a p-i-n structure. The enhanced performance of the postannealed device is ascribed to the decreased trap-state density and improved interface charge-transfer properties. These results demonstrated that this novel organic-free device architecture can be employed to fabricate efficient and stable PSCs for large-scale manufacturing.
研究领域:
材料科学
·
可再生能源
·
应用物理
·
纳米技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Shikai Hu,Tao Shou,Mingming Guo,Runguo Wang,Jun Wang,Hongchi Tian,Xuan Qin,Xiuying Zhao,Liqun Zhang
Thermoplastic polyurethanes (TPUs) have received considerable attention because of their flexible structure and comprehensive performance. 3,3-Dimethyl-4,4′-diphenyl diisocyanate (TODI) was first introduced to fabricate high-performance TPU by tailoring the mole ratio of the hard segment to the soft segment and the molecular weight of the soft segment for three-dimensional (3D) printing. The influence of the microstructure on glass transition temperature, tensile strength, modulus, loss factor, and softening temperature was investigated. The annealing process was proved to increase the degree of microphase separation of TODI-based TPU. Compared with TPU derived from widely commercialized isocyanates, our prepared TODI-based TPU exhibited remarkably high heat resistance. In addition, it is worth noting that our TODI-based TPU prepolymer has long-term and stable storage, which is beneficial for industrial application. This work is crucial to fabricate new TPU elastomer materials with high heat resistance for 3D printing and evaluate the structure–property behavior of TODI-based TPU, which could help other researchers design TODI-based TPU.
研究领域:
高分子材料科学
·
材料化学
·
生物医用材料
·
增材制造
·
热力学性能
·
功能高分子
·
结构-性能关系
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Jingjing Yang,Xun Wang,Gai Zhang,Aijie Ma,Weixing Chen,Le Shao,Chao Shen,Keyu Xie
Solid composite polymer electrolytes are the optimal candidate for all solid-state lithium batteries, because of their enhanced ionic conductivities, long-life cycle ability and compatibility to lithium anode. Herein, we reported a kind of solid composite polymer electrolyte comprised of poly(ethylene oxide), graphitic-like carbon nitride and lithium perchlorate, which was prepared by a facile solution blending method. Microstructure of the solid composite polymer electrolyte was regulated by thermal annealing and interaction among components and was characterized by XRD, DSC, FTIR-ATR, and ROM. The obtained solid composite polymer electrolyte achieved an ionic conductivity as high as 1.76 × 10−5 S cm−1 at 25°C. And the electrochemical stable window and the lithium ion transference number, t+, were also obviously enhanced. LiFePO4/Li solid-state batteries with the annealed PEO-LiClO4-g-C3N4 solid polymer electrolyte presented a high initial discharge capacity of 161.2 mAh g−1 and superior cycle stability with a capacity retention ratio of 81% after 200 cycles at 1C at 80°C. The above results indicates that the thermal annealing treatment and g-C3N4 as a novel structure modifier is crucial for obtaining the high-performance solid composite polymer electrolytes used in the all solid-state lithium battery.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
固体离子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）