JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 41
·51218
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IF 3.125
Di Bao,Fei Xu,Yexiang Cui,Sicheng Yuan,Xiguang Zhang,Yanji Zhu,Yueyang Gao,Huaiyuan Wang
High loadings of fillers are usually needed to achieve high-thermal conductivity (TC) of polymer-based composites, which inevitably sacrifices processability and meanwhile causes high-cost. Therefore, it is of great significance to achieve high-TC composites under low-filler loading. Here, a novel p-phenylenediamine (PPD) modified expanded graphite (EG-PPD)/epoxy (EP) composite with high TC and low-filler content was successfully prepared via pre-dispersion and vacuum assisted mixing strategy. With the improved interfacial compatibility between EG and EP by PPD, the prepared EG-PPD/EP composite exhibited excellent thermal management performance, resulting in the TC of which reached 4.00 W·m −1 ·K −1 with only 10 wt% (5.59 vol%) of EG-PPD, which is approximately 19 times higher than that of pure EP. Meantime, the interface thermal resistance of EG-PPD/EP composite between EG-PPD and EP is reduced by 33% compared with EG/EP composite. This composite with excellent TC property is expected to be used in thermal management field.
研究领域:
材料科学
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聚合物复合材料
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热管理
·
纳米复合材料
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 6
·1393-1398
·
IF 5.976
Shengbin Nie,Ao Liu,You Meng,Byoungchul Shin,Guoxia Liu,Fukai Shan
In this study, transparent p-type CuCrxOy semiconductor thin films were fabricated using spin coating and integrated as channel layers in thin-film transistors (TFTs). The structural, morphological components, and optical properties of CuCrxOy thin films, together with device performance, were systematically investigated. The phase conversion from a mixture of CuCr2O4 and CuO to pure CuCrO2 was achieved when the annealing temperature (Ta) was higher than 700 °C. The electrical performance of the CuCrxOy TFTs on SiO2 dielectric is improved with increasing Ta from 500 °C to 800 °C. The optimized CuCrO2 TFT exhibits an on/off current ratio of ∼105 and a hole mobility of 0.59 cm2 V−1 s−1, which is much better than those previous works on solution-processed binary CuxO TFTs. To our best knowledge, this work demonstrates the ternary p-type CuCrO2 TFTs fabricated via a low-cost solution process for the first time, which represents an important advancement towards the development of all-oxide, low-cost p–n junctions and CMOS logic circuits.
研究领域:
材料科学
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半导体器件
·
薄膜技术
·
电子学
·
纳米技术
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9665-9672
·
IF 10.733
Kanghua Li,Siyu Wang,Chao Chen,Rokas Kondrotas,Manchen Hu,Shuaicheng Lu,Chong Wang,Wei Chen,Jiang Tang
Sb2Se3 is a promising non-toxic, Earth-abundant, stable thin-film solar cell absorber material. However, the low built-in potential caused by the low intrinsic doping density (∼1013 cm−3) and the low carrier collection efficiency due to the low carrier mobility (∼1.5 cm2 V−1 s−1) hinder further efficiency improvement of Sb2Se3 solar cells. Therefore, an effective hole-transport layer (HTL) is necessary to further boost the built-in potential and assist carrier collection. Herein we attempt to improve the efficiency of Sb2Se3 solar cells by using CuSCN as an HTL. CuSCN as an HTL suppresses the back surface recombination, and enhances the built-in potential and carrier collection efficiency. Meanwhile, materials and physical properties characterization reveals that CuSCN provides Cu ions which induce grain boundary inversion, and therefore separate photo-generated carriers more efficiently. Consequently, we obtained a device efficiency of 7.50%.
研究领域:
光伏技术
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材料科学
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半导体器件
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Jinbin Lin,Bo He,Xue Li,Xiaohui Wang,Baoxue Zhou,Pedro J.J. Alvarez,Mingce Long
Selective bond activation in heterogeneous oxidation catalysis remains challenging when multiple competitive pathways coexist. In aminophosphonates, oxidative transformation is typically dominated by kinetically favored C-N cleavage, generating refractory intermediates such as aminomethylphosphonic acid (AMPA). Herein, we demonstrated that selective C-P bond activation could be achieved via active-site coordination engineering. A cobalt single-atom catalyst featuring oxygen-vacancy-linked Zr sites (Co-Ov-Zr ensemble) created a dual-anchoring microenvironment that enforces bidentate adsorption of aminotris(methylenephosphonate), elongating the C-P bond and lowering its cleavage barrier. The vacancy-modified electronic structure promoted efficient peroxymonosulfate activation and Co(IV)=O generation. Consequently, the reaction coordinate was reprogrammed, reversing intrinsic selectivity from C-N to C-P cleavage. The optimized Co-Ov-ZrO 2 /PMS system achieved a five-fold enhancement in phosphate release kinetics compared to the vacancy-free analogue while suppressing AMPA formation. This work establishes adsorption-configuration control as a strategy for designing selective single-atom oxidation catalysts.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xinyi Han,Xiaodong Meng,Shang Chen,Ji Zhou,Manyun Wang,Longhua Sun,Yuncan Jia,Xiaomeng Peng,Hairong Mai,Guangxu Zhu,Jingyu Li,Christopher W. Bielawski,Jianxin Geng
Red phosphorus (RP) is a promising anode material for use in lithium-ion batteries (LIBs) due to its high theoretical specific capacity (2596 mA h g–1). However, the practical use of RP-based anodes has been challenged by the material’s low intrinsic electrical conductivity and poor structural stability during lithiation. Here, we describe a phosphorus-doped porous carbon (P-PC) and disclose how the dopant improves the Li storage performance of RP that was incorporated into the P-PC (designated as RP@P-PC). P-doping porous carbon was achieved using an in situ method wherein the heteroatom was added as the porous carbon was being formed. The phosphorus dopant effectively improves the interfacial properties of the carbon matrix as subsequent RP infusion results in high loadings, small particle sizes, and uniform distribution. In half-cells, an RP@P-PC composite was found to exhibit outstanding performance in terms of the ability to store and utilize Li. The device delivered a high specific capacitance and rate capability (1848 and 1111 mA h g–1 at 0.1 and 10.0 A g–1, respectively) as well as excellent cycling stability (1022 mA h g–1 after 800 cycles at 2.0 A g–1). Exceptional performance metrics were also measured when the RP@P-PC was used as an anode material in full cells that contained lithium iron phosphate as the cathode material. The methodology described can be extended to the preparation of other P-doped carbon materials that are employed in contemporary energy storage applications.
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PubMed
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Shiming Tang,Yukun Chen,Daocheng Liao,Ying Lin,Shuangyan Han,Suiping Zheng
As an essential chemical, p- hydroxystyrene has attracted much attention and is widely used in the field of semiconductors. However, the current production methods have some disadvantages, such as low molar conversion yield, p- hydroxystyrene toxicity, and high substrate cost. To overcome these problems, an five enzymes cell-free cascade, consisting of alditol oxidase from Streptomyces coelicolor A3 (ScALDO), dehydratase from Paralcaligenes ureilyticus (PuDHT), tyrosine phenol lyase from Citrobacter freundii (CfTPL), tyrosine ammonia lyase from Rhodotorula glutinis (RgTAL) and phenylacrylate decarboxylase from Enterobacter sp. (EsPAD ) , was constructed for the de novo biosynthesis of p- hydroxystyrene from glycerol. Through process strategy optimization, a molar conversion yield of more than 84.2% was finally obtained from 10 mM crude glycerol. It is worth mentioning that the reaction system performed an excellent titer using 50 mM crude glycerol, and the p- hydroxystyrene concentration reached 30.32 mM, which exceeded the maximum titer of fermentation. This showed that our system is robust to p- hydroxystyrene and crude glycerol. In addition, a ‘two-step purification process’ was designed to produce pure p- hydroxystyrene. This is the first study focused on the cell-free biosynthesis of p- hydroxystyrene, and the highest conversion yield and titer thus far was obtained for p- hydroxystyrene de novo biosynthesis.
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高影响因子
ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Zhiyuan Zhou,Jiamin Zhang,Xuzhao He,Xiaoyi Chen,Lingqing Dong,Jun Lin,Huiming Wang,Wenjian Weng,Kui Cheng
Surface potentials of biomaterials have been shown to regulate cell fate commitment. However, the effects of chirality-patterned potential distribution on macrophage polarization are still only beginning to be explored. In this work, we demonstrated that the chirality-patterned potential distribution of CoFe2O4/poly(vinylidene fluoride-trifluoroethylene) (CFO/P(VDF-TrFE)) films could significantly down-regulate the M1 polarization of bone marrow-derived macrophages (BMDMs). Specifically, the dextral-patterned surface potential distribution simultaneously up-regulated the expression of M2-related markers of BMDMs. The results were attributed to the sensitive difference of integrin subunits (α5β1 and αvβ3) to the dextral- and sinistral-patterned surface potential distribution, respectively. The interaction difference between the integrin subunits and surface potential distribution altered the cell adhesion and cytoskeletal structure and thereby the polarization behavior of BMDMs. This work, therefore, emphasizes the importance of chirality of potential distribution on cell behavior and provides a new strategy to regulate the immune response of biomaterials.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Peishan Li,Hui Ma,Sijia Qian,Yi Chen,Bo Lai,Shengyan Pu
Ferric sulfide is an appealing activator in persulfate (PS) activation process for degrading pollutants from aqueous environment, but the drawback of easy-agglomeration lead to a low utilization efficiency. In this study, we modified nFeS with sodium carboxymethyl cellulose (CMC) to improve its stability, and the performance for PS activation and p -nitrophenol (PNP) degradation is tested. After modification, the size further decreased from 23.8 to 18.4 nm, but with higher stability and catalytic reactivity. The CMC and nFeS is bonded by bidentate bridging of Fe-O bond. The degradation performance increased ∼7 times. The PS activation with CMC-nFeS activator shows higher reaction rate constant (0.093 min -1 ) with ∼90% of PNP removed compared to the pure nFeS with ∼80% of PNP removal at a low rate (0.014 min -1 ) with the same condition of 0.6 g/L activator, 8 mM PS, room temperature and initial pH in 90 min. Acidic condition and high temperature were more favorable for releasing Fe(II) to activate PS and produce active radicals. SO 4 - ·and HO·radicals played critical roles to attack on PNP. Detailed XPS analysis of the activator before and after reaction described the removal pathway as heterogeneous and homogeneous systems. Density Functional Theory (DFT) simulation results confirmed that CMC addition effectively decreased the interaction energy and improved adsorption ability of PS onto the activator surface.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yanan Li,Wenfang Zheng,Wenxi Li,Renming Pan,Shengjie Yin,Xiangyang Lin
The flexibility of high energy polymers is hindered by bulky and polar high energy groups, resulting in reduced mechanical properties. In this paper, poly(3-azidomethyl-3-methyloxetane-glycol) (P(AMMO-ab-EG)) with an alternating block structure was synthesized and characterized. Diethylene glycol and triethylene glycol are used to improve flexibility, which length in this polymer structure is tightly controlled. (P(AMMO-ab-EG)) exhibits good flexibility, suitable viscosity and good thermal stability. It was found that P(AMMO-ab-DEG) exhibited a lower glass transition temperature but higher viscosity and better temperature viscosity sensitivity than P(AMMO-ab-TEG). These results demonstrate that fine tuning of the block length has a greater effect on T g than on viscosity. This finding is of great significance to prepare energetic polymers with good processing properties and lower T g value. Al, the prepared (P(AMMO-ab-EG) has excellent compatibility with NG (nitroglycerine) and NP (bis(2,2-dinitropropyl)acetal and bis(2,2- dinitropropyl)formal).
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Solar RRL
·
2023
·Vol. 7
·期 20
·2300369
·
IF 7.9
Haoyu Wang,Shuanghong Wu,Haolin Zhang,Xianghua Yao,Furong Wang,Peng Huang,Xiaodong Liu
The light-soaking (LS) effect has been reported to limit the accuracy and stability of device power output of perovskite solar cells (PSCs) and it is significant to develop effective approaches and strategies to eliminate the LS effect in PSCs. There are very few reports on suppressing the LS effect in CsPbI 2 Br-based all-inorganic PSCs. Herein, a method to eliminate the LS effect by synchronous passivation of anionic and cationic defects in CsPbI 2 Br perovskite film is demonstrated. The 4-(chlorosulfonyl)benzoic acid (CSBA) is added into perovskite precursor and the in situ generation of I 3 − effectively passivates the anionic halogen vacancy defects in CsPbI 2 Br. In the meantime, the Lewis base groups on CSBA coordinate with Cs + and Pb 2+ to passivate the cationic defects. This zwitterionic passivation effect of CSBA remarkably cuts off the path of defect-induced charge recombination and thus eliminates the LS effect. This work offers a deep opinion for future researchers to modulate the LS effect of all-inorganic PSCs.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mingyang Wang,Hu Li,Qian Xin,Mingyu Zhuang,Zhiyuan Wang,Yuzhuo Yuan,Xuemei Yin,Xiaoxiao Zheng,Jiawei Zhang,Aimin Song
Self-assembled monolayer (SAM) treatment of gate dielectrics plays a key role in the improvement of the electrical performance of organic thin-film transistors (TFTs) by reducing the interface traps. However, it is rarely explored in inorganic TFTs owing to possible irreversible damage to very thin SAMs during the sputtering and high-temperature annealing processes that are often used to deposit inorganic materials. Here, the feasibility of performance enhancement of inorganic p-type Zn-doped CuI TFTs is explored by a SAM treatment using 3-aminopropyltriethoxysilane (APTES) on the gate dielectric. Our result shows that the TFT performance is significantly enhanced with a 50% reduction in the interface trap density, a 326% increase in the hole mobility from 0.38 to 1.24 cm 2 V -1 s -1 and a 5-fold increase in the current on/off ratio from 2.6 × 10 6 to 1.1 × 10 7 . In addition, the bias stress stability of the TFTs after the treatment is dramatically enhanced by a factor of 10 due to the improved interface properties. The threshold voltage shift is reduced from +19.6 to +1.8 V after 3600 s positive bias stress. The simple yet effective interface treatment approach may have great potential in the fabrication of high-performance inorganic p-type electronic devices.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Keni Zeng,Ling Lei,Can Wu,Kangbing Wu
Using planar π-conjugated 2,5-diamino-1,4-benzenedithiol as organic ligand, Co-based conjugated coordination polymers (CoCCPs) with different morphology were prepared through controlling the injection rate of Co 2+ . When the injection rate decreases from 1.00 to 0.25 mL min −1 , the obtained CoCCPs change from 2D nanosheets to quasi-1D nanorods . It is found that the different-shaped CoCCPs exhibit varying electrochemical sensing performance. The prepared CoCCPs-1 with quasi-1D nanowires and porous network structure possesses larger active area, faster electron transfer and higher accumulation ability. Moreover, the CoCCPs-1 is more active for the oxidation of p -nitrophenol (PNP), and greatly enhances its oxidation signal. Based on the morphology-tuned sensing performance of CoCCPs, a highly-sensitive electrochemical sensor has been developed for PNP, with detection limit of 0.00986 μM (9.86 nM). It was used in the analysis of wastewater samples, and the results is validated by other instrumental method.
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