ADVANCED FUNCTIONAL MATERIALS
·
2011
·Vol. 21
·期 4
·786-791
·
IF 8.508
Jing Zhang,Yan Zhao,Zhongming Wei,Yimeng Sun,Yudong He,Chong-an Di,Wei Xu,Wenping Hu,Yunqi Liu,Daoben Zhu
A graphite thin film was investigated as the drain and source electrodes for bottom-contact organic field-effect transistors (BC OFETs). Highly conducting electrodes (10 2 S cm −1 ) at room temperature were obtained from pyrolyzed poly(l,3,4-oxadiazole) (PPOD) thin films that were prepatterned with a low-cost inkjet printing method. Compared to the devices with traditional Au electrodes, the BC OFETs showed rather high performances when using these source/drain electrodes without any further modification. Being based on a graphite-like material these electrodes possess excellent compatibility and proper energy matching with both p- and n-type organic semiconductors, which results in an improved electrode/organic-layer contact and homogeneous morphology of the organic semiconductors in the conducting channel, and finally a significant reduction of the contact resistance and enhancement of the charge-carrier mobility of the devices is displayed. This work demonstrates that with the advantages of low-cost, high-performance, and printability, PPOD could serve as an excellent electrode material for BC OFETs.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Xiujuan Liu,Ying He,Guangcong Zhang,Ran Wang,Jingxin Zhou,Lexin Zhang,Jianmin Gu,Tifeng Jiao
Understanding photocurrent conversion of layered double hydroxide (LDH) materials will be a key step in the future application of these materials to light-capturing molecular devices. In the present study, ultrathin nickel–iron layered double hydroxide/dye (NF-LDH/dye) Langmuir–Blodgett (LB) semiconductor films were prepared using an LB device and deposited on an indium tin oxide (ITO) substrate as a photoanode. The photoelectric conversion efficiency of the prepared LB semiconductor film materials was tested. A comparative experiment was performed to effectively explore the photoelectric conversion performances of the LB semiconductor film materials. Specifically, the NF-LDH cast film electrode, the dye cast film electrode, and an ultrathin composite LB film electrode were used as typical samples to explore photoelectric conversion performances. The electrochemical workstation was used to study the photocurrent density, linear scanning voltammetry curve, and electrochemical impedance spectroscopy of LB film electrodes with different layers. The results show that the film electrode cast by LDH alone or dye alone produces weak photocurrent. The photoelectric conversion efficiency of the LB film electrode is enhanced due to the different dyes’ molecular structures and/or aggregations on the surface of LDH with various morphological patterns. The combined NF-LDH/dye composite LB film photoelectrode can generate a photocurrent that is 2–5 times stronger than the raw material, and the stable use efficiency is more than 92%. Present obtained composite LB films demonstrated a uniform morphology and good photoelectric conversion ability. This work provides a useful reference for the field of LDH semiconductor optoelectronic devices and solar cells.
研究领域:
材料科学
·
光电化学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 40
·2503523
·
IF 19
Zi-Lin He,Wen-Guang Li,Jing-Hua Chen,Jian-Bin Luo,Jun-Hua Wei,Qing-Peng Peng,Dai-Bin Kuang
Organic–inorganic hybrid metal halides are emerging as a class of functional materials that combine attractive photophysical properties with great processability. Their modular chemical structures allow for melt processing through crystal-melt transitions. Herein, the study reports the synthesis of (Bzmim) 2 MnX 4 (Bzmim = 1-benzyl-3-methylimidazolium, X = Cl, Br, I) single crystals with low melting temperatures ranging from 130 to 160 °C. Among them, (Bzmim) 2 MnBr 4 exhibits superior luminescence performance with a photoluminescence quantum yield of 78.6% and a light yield of 34 900 photons MeV −1 , making it act as a promising scintillator. Interestingly, leveraging the melt fluidity and the porous structure of nylon film, a transparent crystalline (Bzmim) 2 MnBr 4 -Nylon composite film is fabricated by the melt-infiltration process. Compared to the nylon film, the composite film has an increased light transmittance from ≈20% to >60%. It can be attributed to uniform melt crystallization in the pores of nylon film, which suppresses severe light crosstalk caused by the large refractive index difference at the nylon-air interface. The melt-processable transparent composite film exhibits a spatial resolution of 16 line pairs per millimeter in practical X-ray imaging, as well as promising applications in curved X-ray imaging due to its great flexibility.
研究领域:
材料科学
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光学材料
·
辐射探测
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柔性电子学
·
X射线成像技术
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Haojie Xing,Bin He,Stephan Handschuh-Wang,Xinqing Gao,Junrong Zeng,Zongyan Zhang,Qiyuan Chen,Jiangtao Huang,Peigang Han
The integration of diamond films onto copper substrates offers significant potential for thermal management in high-power electronics, leveraging diamond's exceptional thermal conductivity and electrical insulation. However, substantial challenges arise from the significant thermal expansion coefficient (CTE) mismatch, leading to substrate warping and film cracking. This study establishes a critical substrate thickness effect through systematic experiments: Single-side nanocrystalline diamond (NCD) deposited on thin copper substrates (0.5 mm) exhibits severe warping (curvature radius: 55.53 mm) but maintains film integrity, whereas identical deposition on thick copper (1.5 mm) reduces warping (radius: 219.4 mm) yet induces extensive cracking due to amplified compressive stress. To overcome this trade-off, we develop a dual-side heterogeneous deposition strategy: NCD grown at low temperature (700 °C) on one side provides strain accommodation, while subsequent microcrystalline diamond (MCD) deposition on the opposite side achieves stress cancellation. This approach simultaneously resolves both failure modes---increasing the warpage radius to 395.03 mm (an increase of 711 % compared to single-side deposition) while ensuring crack-free integrity in both 5 μm thick deposited films. The underlying mechanisms involve: (1) Gradual stress decay through a gradient interfacial architecture (amorphous carbon layer - nanocrystalline buffer - microcrystalline main layer); (2) Enhanced adhesion via mechanical interlocking induced by substrate pretreatment; (3) Plastic deformation at the interface absorbing residual strain. Thermal testing confirms hot-end temperature reductions of 7.7 °C and 42.2 °C compared to AlN and Al₂O₃, respectively, at 6 W power, validating superior heat dissipation. This work provides an electrically insulating diamond‑copper composite with high thermal conductivity for next-generation thermal management solutions.
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DOI
高影响因子
ACS Nano
·
2018
·
IF 13.709
Yi Wu,Jing Zeng,Yinsong Si,Min Chen,Limin Wu
Transparent superamphiphobic surfaces that repel various liquids have many important applications, but there are critical challenges in their fabrication, such as expensive or complicated fabrication methods, contradictions between the rough surface for superamphiphobicity and smooth surface for transparency, large-area fabrication, etc. Herein, we report a simple and effective strategy for large-scale fabrication of robust, transparent, and superomniphobic polymer films by combined unidirectional rubbing and heating-assisted assembly technology. The obtained polymer films display two kinds of special structures of monolayer ordered re-entrant geometries with either hexagonally triangular protrusions or with hexagonally rectangular micropillars, depending upon the sphere diameters of silica templates, and demonstrate excellent repellence to water and low-surface-tension liquids, as well as high transparency.
研究领域:
材料科学
·
表面工程
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DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 9
·1099
·
IF 2.881
Yifei Wang,Xiaoping Zou,Jialin Zhu,Chunqian Zhang,Jin Cheng,Junqi Wang,Xiaolan Wang,Xiaotong Li,Keke Song,Baokai Ren,Junming Li
With the development of the semiconductor industry, research on photoelectronic devices has been emphasized. In this paper, a molecular semiconductor material with a narrow bandgap of hexane-1,6-diammonium pentaiodobismuth (HDA-BiI5) was utilized to prepare photodetectors without electron transport layers. Using a single light source, the effects of different wavelengths and different powers on the photoresponsivity, switching ratio, specific detectivity, and external quantum efficiency of the device were investigated. It is demonstrated that this device has excellent responsivity, specific detectivity, stability, and repeatability, and this work will help expand the application of molecular semiconductor materials for photodetection.Keywords:photodetector;molecular semiconductor;thin films
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 10
·762
·
IF 4.3
Mingkun Zheng,Wancheng Zhang,You Lv,Yong Liu,Rui Xiong,Zhenhua Zhang,Zhihong Lu
The low-symmetry Weyl semimetallic Td-phase WTe2exhibits both a distinct out-of-plane damping torque (τDL) and exceptional charge–spin interconversion efficiency enabled by strong spin-orbit coupling, positioning it as a prime candidate for spin–orbit torque (SOT) applications in two-dimensional transition metal dichalcogenides. Herein, we report on thickness-dependent unconventional out-of-planeτDLin chemically vapor-deposited (CVD) polycrystalline Td-WTe2(t)/Ni80Fe20/MgO/Ti (Td-WTN-t) heterostructures. Angle-resolved spin-torque ferromagnetic resonance measurements on the Td-WTN-12 structure showed significant spin Hall conductivities ofσSH,y= 4.93 × 103(ℏ/2e) Ω−1m−1andσSH,z= 0.81 × 103(ℏ/2e) Ω−1m−1, highlighting its potential for wafer-scale spin–orbit torque device applications. Additionally, a detailed examination of magnetotransport properties in polycrystalline few-layer Td-WTe2films as a function of thickness revealed a marked amplification of the out-of-plane magnetoresistance, which can be ascribed to the anisotropic nature of charge carrier scattering mechanisms within the material. Spin pumping measurements in Td-WTN-theterostructures further revealed thickness-dependent spin transport properties of Td-WTe2, with damping analysis yielding an out-of-plane spin diffusion length ofλSD≈ 14 nm.
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DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 19
·2207520
·
IF 13.3
Jianan Chen,Zhaobing Tang,Yangzhou Zhou,Shuo Ding,Liang Li,Lei Qian,Chaoyu Xiang
Formamidine lead iodide (FAPbI 3 ) is an important material for realizing high-performance near-infrared light-emitting diodes (NIR-LEDs). However, due to the uncontrollable growth of solution-processed films which usually causes low coverage, and poor surface morphology, the development of FAPbI 3 -based NIR-LEDs is hindered, restraining its potential industrial applications. In this work, by employing glutamine (Gln) in perovskite precursor, the quality of FAPbI 3 film is improved significantly. Due to the ameliorated solution process by the organic additive, the film coverage over the substrate is substantially enhanced. Meanwhile, the trap state of grain is largely reduced. Consequently, NIR perovskite LEDs are demonstrated with a maximum external quantum efficiency (EQE) of 15% with the emission peak at 795 nm, which is four times higher than the device with pristine perovskite film.
研究领域:
材料科学
·
光电学
·
化学
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DOI
高影响因子
MACROMOLECULES
·
2020
·
IF 5.918
Jianquan Xu,Chao Lv,Binyang Du,Xinping Wang,Ophelia K. C. Tsui
We show that the thickness, h0, dependence of the effective viscosity, ηeff(h0), of unentangled random copolymer films of styrene (St) and 4-methoxystyrene (MeOS) supported by silica (SiOx) can be easily tuned by tuning the MeOS concentration, XMeOS, in the copolymer. When XMeOS is increased from 0% to 100%, ηeff(h0) changes steadily from suppressed to enhanced with decreasing film thickness. At XMeOS = 10%, ηeff(h0) displays a nonmonotonic variation. Results obtained by fitting a three-layer model to the ηeff(h0) data show that ηeff(h0) of the XMeOS = 0% film was dominated by the mobility-enhancing effect of the free surface, but as XMeOS increases, the mobility-slowing effect of the substrate surface increases and dominates. The results also show that the propagation distance, lt, of the substrate effect increases with increasing XMeOS and is ∼2.6 to 6 times the radius of gyration of the polymer. We tentatively suggest the long propagation distances to be caused by the long-range van der Waals interactions. Analysis of the van der Waals interfacial potentials of the films supports this interpretation.
研究领域:
高分子物理
·
材料科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·542-547
·
IF 2.195
Zhang Xiuyun,Zhao Yunyun,Ling Qia,Zhu Guisheng,Zhou Xiujuan,Deng Jianqiu,Yan Dongliang,Liu Laijun,Xu Huarui,Yu Aibing
Amorphous Li–Si–Ti–P–O (LSTP) thin film electrolyte was successfully prepared by radio frequency magnetron sputtering using Li 1.4 Si 0.4 Ti 1.6 (PO 4 ) 3 powder targets and stainless steel sheet as substrate. The effects of sputtering power on the structure, morphology, ionic conductivity, and electronic conductivity of the LSTP thin film electrolyte were investigated. The results showed that the LSTP thin film electrolyte obtained with sputtering power kept at 160 W, displayed uniform particles compacted in arrangement, proper stoichiometric ratio to the powder target as well as sufficient Li-ion for diffusion. Hence, it held a considerable ionic conductivity of 4.12 × 10 −6 S cm −1 and a high σ ion / σ ele ratio about 8 magnitudes, indicating that it can be used as film electrolyte in all-solid-state lithium batteries.
研究领域:
材料科学
·
电化学
·
固态离子学
·
薄膜技术
·
能源材料
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Yinchuan Pu,Duoduo Huang,Su Wang,Wei Xu
Developing robust and durable superhydrophilic surfaces on polyethylene terephthalate (PET) films is critical for advancing their applications in self-cleaning and biomedical technologies. In this study, a coating solution containing polyethyleneimine and HDI polyisocyanate was bar-coated onto PET film surfaces and subsequently cross-linked to form a dense R-NH-CO-NH-R' covalent network. After modification, the PET film surfaces demonstrated superhydrophilicity (WCA=0°) accompanied by a significant increase in surface energy to 79.4 mN/m, while achieving excellent 5B-grade adhesion. Furthermore, when exposed to 40-hour immersion in aqueous solutions, the modified surfaces maintained their superhydrophilicity (0° WCA) with essentially unchanged surface energies. The coatings showed near-complete surface coverage along with substantial covalent bonds retention. Such crosslinking construction approach via bar-coating exhibits promising potential for PET films in superhydrophilic applications.
研究领域:
生物医学工程
·
材料科学
·
表面工程
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产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 6
·820
·
IF 3.236
Andong Wang,Jianhua Liu,Chenkang Shao,Youming Zhang,Caifeng Chen
Polyvinylidene fluoride (PVDF) films are widely used in sensors for their wide response frequency, good flexibility, low acoustic impedance, and chemical stability. In this work, PVDF/CaCl2piezoelectric films were prepared by an electro-assisted 3D printing method and used to form a multi-layer composite film sensor. The study found that the addition of CaCl2can effectively increase theβ-phase content in the PVDF film and improve the piezoelectric and dielectric properties of the PVDF composite film sensors. When the content of CaCl2is 0.15 wt.%, theβ-phase content of the PVDF/CaCl2composite film can reach the highest value of up to 48.47%, and the output voltage response of the sensor is 0.62 V at an input frequency of 10 Hz, 10 V voltage. The output voltage of PVDF composite film sensor with two and three layers is 1.306 and 1.693 times that of a single layer, respectively. The sensitivity of the multi-layer sensors has also been greatly improved.Keywords:3D printing;film;composite;sensor
研究领域:
材料科学
·
电子工程
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高影响因子
危险品化学品经营许可证（带存储）