Laser & Photonics Reviews
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2024
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IF 9.8
Ting Gong,Yang Yang,Tongtong Xuan,Wenhao Bai,Haorui Dong,Tianliang Zhou,Rong-Jun Xie
Quantum dot (QD) color conversion films (QD-CCFs) are used in ultrahigh definition (UHD) Mini-LED backlit displays due to their narrow band emission and high color purity. However, their poor light conversion efficiency (LCE) leads to greater film thickness and thus high cost. Herein, this study proposes a local light field control strategy to enhance the LCE of QD-CCFs using high-refractive BN nanosheets. The LCEs of the green and red QD-CCFs can increase from 29.9% and 34.8% to 67.4% and 91.0% after adding BN nanosheets, respectively. Combining the experimental data with the finite-difference time domain (FDTD) simulations, the enhanced LCEs can be attributed to observably increased blue light absorption and improved light extraction efficiency of the light emitted from QDs. The white Mini-LEDs, prepared by integrating the optimized QD-CCFs containing BN nanosheets with blue Mini-LED chips, show a high luminous efficiency of 70.2 lm W −1 , a high external quantum efficiency of 36.2%, and a wide color gamut of 96.3% Rec . 2020 standards. This work provides an interesting idea for designing high-efficiency QD-CCFs toward low-cost UHD Mini-LED backlit displays.
研究领域:
光学材料
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显示技术
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DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2024
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IF 8.3
Sijia Sun,Shuai Zhang,Mingzhu Pan
Intelligent fire warning system is a crucial protective equipment reduce fire hazards . A recent increasing concern is the development of sensitive fire warning materials that can be integrated with combustible materials to provide real-time alarms in the fire. However, current research on improving the sensitivity of fire warning sensors based on temperature-resistance response focuses on constructing continuous conductive networks. The effect of the heat transfer process is ignored, which limits the further improvement of alarm sensitivity. Here, we developed a strategy to improve thermal conductivity . Based on the chitosan (CS) conductive network in Ti 3 O 5 -based fire sensing system, aminated 2D h-BN nanosheets with high temperature resistance and ultrahigh in-plane thermal conductivity were further introduced. The h-BN improves the thermal conductivity of the fire warning coating from 1.43 W/m·K to 2.29 W/m·K. Intelligent fire warning sensors with ultra-sensitivity (1.16 s), low response temperature (170 °C), duration time (12 min) and durability (100 cycles) were successfully prepared by improving thermal conductivity to rapidly transfer heat to Ti 3 O 5 , which leads to a rapid decrease in resistance as the core mechanism. This work proposed an ingenious strategy for the construction of high fire safety and thermal conduction fireproof coatings, which revealed enticing prospects in the field of intelligent coatings.
研究领域:
材料科学
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传感技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Yuehan Cao,Ruiyang Zhang,Tianli Zhou,Shengming Jin,Jindi Huang,Liqun Ye,Zeai Huang,Fang Wang,Ying Zhou
Limited by the chemical inertness of CO2 and the high dissociation energy of the C═O bond, photocatalytic CO2 conversion is highly challenging. Herein, we prepare ultrathin oxygen-modified h-BN (O/BN) nanosheets containing B–O bonds. On the O/BN surface, CO2 can be chemically captured and is bonded with the B–O bond, leading to the formation of an O–B–O bond. This new chemical bond acting as an electron-delivery channel strengthens the interaction between CO2 and the surface. Thus, the reactants can continuously obtain electrons from the surface through this channel. Therefore, the majority of gaseous CO2 directly converts into carbon active species that are detected by in situ DRIFTS over O/BN. Moreover, the activated energies of CO2 conversion are significantly reduced with the introduction of the B–O bond evidenced by DFT calculations. As a result, O/BN nanosheets present an enhanced photocatalytic CO2 conversion performance with the H2 and CO generation rates of 3.3 and 12.5 μmol g–1 h–1, respectively. This work could help in realizing the effects of nonmetal chemical bonds in the CO2 photoreduction reaction for designing efficient photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Scientific Reports
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2019
·Vol. 9
·期 1
·1-11
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IF 4.011
Chen Yang,Wang Xing,Yu Chao,Ding Jun,Deng Chengji,Zhu Hongxi
r-BN nanoflakes were synthesized using KBH 4 and NH 4 Cl as the main raw material in a high-purity nitrogen atmosphere. The effects of salt and salt-free conditions and heating temperature on the synthesis of BN were studied. The molten-salt method was used to synthesize BN at 650 °C, which was 250 °C lower than the BN synthesis method without salt. Furthermore, at 1000 °C the prepared flake-like BN crystals showed good crystallinity, uniform morphology, a particle diameter of 200–300 nm, and a thickness of 40–70 nm. Moreover, the specific surface area of BN was 294.26 m 2 /g. In addition, the BN synthesized at 1100 °C had a large elastic modulus value and good oxidation resistance.
研究领域:
材料科学
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化学工程
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Sheng Li,Sidra Subhan,Liqin Zhou,Jing Li,Zhongxing Zhao,Zhenxia Zhao
Improving the adsorption capacity of the volatile organic compounds (VOCs) will inevitably decrease the desorption efficiency and hence increase more energy-consumption, which has become a crucial challenging problem for MOFs modification and composition toward VOCs adsorption. Herein, a thermal-conductive composition strategy was proposed to anchor BN nanosheets (BNNS) into HKUST-1 crystals via “N/O-Cu-O” interface. The formed HKUST-1@BNNS composite maintained high surface area (1633.7 m 2 /g having more microporous) and enhanced heat diffusivity (1.8 times of HKUST-1), simultaneously. This enabled significant increase of toluene adsorption capacity on HKUST-1@BNNS up to 4.3 mmol/g (2.8 times of HKUST-1) at ultra-low pressure ( P / P 0 ≈ 0.001) and higher desorption rate of toluene ( k ds = 29.3 × 10 −2 , 4.0 times of HKUST-1) with lower desorption activation energy ( E d = 33.5 kJ/mol). Compared with many other state-of-the-art adsorbents (e.g., MOFs, zeolites and activated carbons), it has a much higher adsorption capacity and regeneration rate. Thus, thermal-conductive MOFs construction can be deemed as smart strategy to enhance adsorption efficiency and save desorption energy for VOCs capture.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2024
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IF 6.5
Beibei Chen,Wenquan Dong,Wenchao Shi,Xuanlin Li,Bi Yang,Yang Tong,Lin Zhang,Jianzhang Wang
Developing high-performance of organic solid lubricating coating is of great significance for extending the life of the moving systems/parts. Herein, the non-covalently modified h-BN nanosheets by graphene oxide (BNNSs/GO) were elaborately constructed to enhance the mechanical, friction and wear properties of epoxy nanocomposite coating. The microstructure feature and chemical composition of BNNSs/GO were determined by various spectroscopic techniques. The tribological performance of nanocomposite coatings were tested using ball-on-disc friction tester, and 440C stainless-steel ball with diameter of 8 mm was used as the counterface material. The GO nanosheets acted an active platform for BNNSs, which improved the dispersion of BNNSs and interface interaction with epoxy. The anchoring BNNSs could break the strong π-π, and van der Walls forces among GO nanosheets. The thickness of epoxy nanocomposite coatings was about 60 μm. And the epoxy-1.0 wt%BNNSs/GO demonstrated much higher hardness and elastic modulus than epoxy, increased by 112.62 % and 53.37 %, respectively. The coefficient of friction (COF) and wear rate of epoxy-1.0 wt%BNNSs/GO were the lowest, with a reduction of 89.7 % and 97.5 %, respectively. The synergistic lubricating mechanism of epoxy-BNNSs/GO coating was proposed, which could provide a new light on the design of high antifriction and wear resistance of organic nanocomposite coating.
研究领域:
材料科学
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表面工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）