Nanomaterials
·
2019
·Vol. 9
·期 5
·706
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IF 4.034
Chaoqun Wu,Yudan Zhou,Haitao Wang,Jianhua Hu
Zwitterionic polymers are suitable for replacing poly(ethylene glycol) (PEG) polymers because of their better antifouling properties, but zwitterionic polymers have poor mechanical properties, strong water absorption, and their homopolymers should not be used directly. To solve these problems, a reversible-addition fragmentation chain transfer (RAFT) polymerization process was used to prepare copolymers comprised of zwitterionic side chains that were attached to an ITO glass substrate using spin-casting. The presence of 4-vinylpyridine (4VP) and zwitterion chains on these polymer-coated ITO surfaces was confirmed using 1H NMR, FTIR, and GPC analyses, with successful surface functionalization confirmed using water contact angle, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) studies. Changes in water contact angles and C/O ratios (XPS) analysis demonstrated that the functionalization of these polymers with β-propiolactone resulted in hydrophilic mixed 4VP/zwitterionic polymers. Protein adsorption and cell attachment assays were used to optimize the ratio of the zwitterionic component to maximize the antifouling properties of the polymer brush surface. This work demonstrated that the antifouling surface coatings could be readily prepared using a “P4VP-modified” method, that is, the functionality of P4VP to modify the prepared zwitterionic polymer. We believe these materials are likely to be useful for the preparation of biomaterials for biosensing and diagnostic applications.Keywords:copolymer;biofilms;spin-casting;antifouling
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
Chinese Physics B
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2018
·Vol. 27
·期 1
·015202
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IF 1.321
Menghua Zhu,Yaxin Deng,Weiwei Liu,Xin Li
A new hybrid organic-inorganic structure of FTO/TiO2/Se/HTL/Au based selenium solar cell has been fabricated through a low-cost spin-coating process in air. In this process, selenium is completely dissolved in hydrazine, to form a homogeneous precursor solution. After spin-coating the precursor solution on the TiO2 substrates, following by sintering at 200 °C for 5min, a uniform selenium film with crystalline grains is formed. The selenium based solar cell exhibits an efficiency of 1.23% under AM1.5 illumination (100 mW⋅cm−2), short-circuit current density of 8 mA⋅cm−2, open-circuit voltage of 0.55 V, and fill factor of 0.37. Moreover, the device shows a stable ability with almost the same performance after 60 days.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·318
·
IF 3.504
Xin Zhang,Caichi Liu,Gang Ren,Shiyun Li,Chenghao Bi,Qiuyan Hao,Hui Liu
Hybrid organic-inorganic perovskite materials have attracted extensive attention due to their impressive performance in photovoltaic devices. One-dimensional perovskite CH3NH3PbI3nanomaterials, possessing unique structural features such as large surface-to-volume ratio, anisotropic geometry and quantum confinement, may have excellent optoelectronic properties, which could be utilized to fabricate high-performance photodetectors. However, in comparison to CH3NH3PbI3thin films, reports on the fabrication of CH3NH3PbI3nanowires for optoelectrical application are rather limited. Herein, a two-step spin-coating process has been utilized to fabricate pure-phase and single-crystalline CH3NH3PbI3nanowires on a substrate without mesoporous TiO2or Al2O3. The size and density of CH3NH3PbI3nanowires can be easily controlled by changing the PbI2precursor concentration. The as-prepared CH3NH3PbI3nanowires are utilized to fabricate photodetectors, which exhibit a fairly high switching ratio of ~600, a responsivity of 55 mA/W, and a normalized detectivity of 0.5 × 1011jones under 532 nm light illumination (40 mW/cm2) at a very low bias voltage of 0.1 V. The as-prepared perovskite CH3NH3PbI3nanowires with excellent optoelectronic properties are regarded to be a potential candidate for high-performance photodetector application.Keywords:perovskite;CH3NH3PbI3nanowires;spincoating;photodetectors
研究领域:
材料科学
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光电子学
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PubMed
高影响因子
Soft Matter
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2018
·Vol. 14
·期 28
·5888-5897
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IF 3.709
Si Yu Zheng,Ye Tian,Xin Ning Zhang,Miao Du,Yihu Song,Zi Liang Wu,Qiang Zheng
Hydrogel films have promising applications in medical dressings, flexible electronics, etc. However, it is challenging to fabricate ultrathin hydrogel films with high toughness and controllable thickness. Here, we report a facile approach to prepare tough physical hydrogel films by spin-coating of a poly(acrylic acid-co-acrylamide) (P(AAc-co-AAm)) solution and subsequent gelation in FeCl3 solution to form carboxyl–Fe3+ coordination complexes. The thickness of the obtained gel films, ranging from several to hundreds of micrometers, was easily tunable by adjusting the spin conditions and polymer concentration. The thus obtained hydrogel films showed excellent mechanical properties, with tensile breaking strengths of 0.6–14.5 MPa, breaking strains of 140–840%, Young's moduli of 0.1–61.7 MPa, and tearing fracture energies of 300–1300 J m−2. Based on this approach, responsive tough hydrogel films can also be prepared by spin-coating of a poly(acrylic acid-co-N-isopropylacrylamide) (P(AAc-co-NIPAm)) solution. The obtained gel films showed a fast response (<60 s) and a large output force (∼0.2 MPa) triggered by a concentrated saline solution, making them an ideal material in the design of chemomechanical devices. Furthermore, a bilayer hydrogel film was fabricated by two-step spin-coating of P(AAc-co-NIPAm) and P(AAc-co-AAm) solutions, which showed reversible bending deformation under external stimuli. This simple yet effective approach should be applicable to other systems to prepare versatile hydrogel films with tunable thickness and promising applications in diverse areas.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
·
IF 6.3
Yunjie Bai,Yiming Wang,Ruijian Liu,Yu He,Yuhao Zhang,Chu Liu,Hongmei Luan,Yanchun Yang,Chengjun Zhu
The CZTSSe absorber layer prepared with DMSO exhibits extensive cavities at its bottom, and a prominent double-layer structure is frequently observed within the CZTSSe absorber synthesized using DMF , both of which have a detrimental impact on the device performance. In this paper, an alternate spin-coating process using DMSO and DMF solvent systems is proposed, which eliminates the double-layer structure of CZTSSe and reduces the number of cavities at the bottom of the absorber layer, thereby enhancing its overall quality. This method outperforms the traditional single-solution spin-coating technique by combining the advantages of two solvent systems, allowing for the preparation of an ideal CZTSSe film without disturbing the elemental ratio, ultimately resulting in a single-layer absorber composed of large grains. After three repetitions of an identical alternate spin-coating process, the average grain size of the absorber layer increased from 0.83 to 1.21 μm. This innovative process leads to a reduction in carrier recombination and an improvement in the short-circuit current density, ultimately raising the photoelectric conversion efficiency from 7.40% to 8.88%.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2016
·
IF 3.15
Jiajia Jiang,Hai jun Tao,Shanlong Chen,Bin Tan,Ning Zhou,Lumin Zhu,Yuan Zhao,Yuqiao Wang,Jie Tao
Sequential spin-coating procedure is a widely adopted strategy to prepare CH 3 NH 3 PbI 3 on mesostructured TiO 2 electrode for organolead halide perovskite-based solar cells. However, this method suffers from the rough surface and excessively residual PbI 2 in the resulting perovskite film, deteriorating the device performance seriously. Herein, a facial modified sequential solution deposition method, by introducing an as-prepared CH 3 NH 3 PbI 3 and PbI 2 film before the traditional two-step process, was proposed to fabricate the perovskite-based solar cell with smooth morphology and trace amount of remaining PbI 2 . The optimal as-prepared film introduced improves the efficiency of CH 3 NH 3 PbI 3 solar cells from 9.11% to 11.16%. The enhancement of device performance can be attributed to the increased light absorption ability and decreased recombination rate of carriers in CH 3 NH 3 PbI 3 absorber.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
L. Wu,D.J. Yang,C.J. Hu,S. Liu,Q.G. Chen,J.Y. Shi,F. Wu,Y. Xiang
The electrodeposition-based three-state electrochromic device with its electrode surface modified by dip-coated titanium dioxide (TiO 2 ) thin films shows significantly improved cycling stability compared to the device modified with spin-coated ones. The decrement rate of optical transmittance contrast for spin-coated device after 1500 cycles is reduced significantly from 66% to 28% for dip-coated device, indicating ~60% improvement. A comparative study of the structural and morphological features of dip- and spin-coated TiO 2 thin films reveals that the surface uniformity of dip-coated device is much better than that of spin-coated one, leading to an improved overall surface roughness, which is a primary factor of the cycling stability. Although the difference in the surface roughness is marginal for the smooth parts of both the dip- and spin-coated TiO 2 thin films, the improved uniformity of the dip- coated TiO 2 thin film surface is conducive to the quick dissolution of Ag back into electrolyte during the switching between the coloration and bleaching states thanks to the reduced locally residual Ag around or into the rough regions caused by TiO 2 nanoparticles agglomeration.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 7
·5814-5819
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IF 2.324
Diao Chunli,Liu Hanxing,Hao Hua,Cao Minghe,Yao Zhonghua
Mn-doped barium strontium titanate Ba 0.4 Sr 0.6 TiO 3 - x mol%Mn ( x = 0, 1, 3 and 5; BSTM x ) thin films were deposited on Pt/Ti/SiO 2 /Si(100) substrates by spin-coating and annealed at 800 °C. X-ray diffraction patterns revealed that all the thin films were a typical cubic perovskite structure and no impurity peaks were observed. The effect of Mn doping on the ferroelectric properties and energy storage performance of the samples was investigated. The results showed that the recoverable energy storage density U rec and the difference ∆ P ( P max − P r ) between maximum polarization P max and remnant polarization P r firstly increased, then decreased with the increase of Mn doping amount. The optimized energy storage performance was obtained in Pt/BSTM3/Pt thin films: energy storage density of 8.48 J/cm 3 and energy storage efficiency of 42.4% at 1.63 MV/cm, electrical resistivity of 4.19 × 10 10 Ω cm and leakage current density of 7.77 × 10 −6 A/cm 2 at 163 kV/cm. Moreover, the effect of different top electrodes on energy storage performance was studied, which displayed that the energy density of Au/BSTM3/Pt films was higher than that of Pt/BSTM3/Pt films. The results indicated that Mn doping and Au electrodes could be effective ways to improve the energy storage properties of BST thin films.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
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2019
·Vol. 39
·期 10
·917-925
·
IF 1.072
Danbo Mao,Gang Lv,Guohan Gao,Bin Fan
Optical polyimide (PI) films were prepared by spin-coating from nearly non-volatile dimethylacetamide (DMAc) solutions. The uniformity of film thickness met the requirements of diffraction imaging quality. The results show that the final rotating speed ω , dynamic viscosity η , and initial polymer solid concentration c are the main factors affecting the film thickness T , and an empirical relationship which describes the film thickness as a function of the measured parameters was established to be T ∝ c 3.473 , η 0.586 , ω − 0.811 . Moreover, the viscosity dependence on concentration is system specific. Unlike traditional photoresist, the thickness uniformity of the PI film is determined by both spinning and precure process, which is intensively discussed in the present work. Uniform, 22-μm thick, PI films with transmitted wavefronts peak to valley (PV) ≤ 1/5 λ and root mean square (RMS) ≤ 1/50 λ were prepared under the optimum process: spin speed 900 rpm, initial fluid viscosity 10,500 cp, final spin time 120 s, precure temperature 70°C, spin process repeated 3 times. The results will find use in the production of optical quality membrane for ultra-lightweight optics or other applications.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2016
·
IF 2.139
Qiuhua Yuan,Jianbo Wu,Caoping Qin,Anping Xu,Ziqiang Zhang,Songxin Lin,Xiangzhong Ren,Peixin Zhang
Zn-doped hydroxyapatite/polylactic acid (HA/PLA) composite coatings fabricated by spin-coating technique have rarely been studied by other researchers in recent years. In this study, Zn-doped hydroxyapatite (Zn-doped HA) powder were synthesized by chemical precipitation method, and then Zn-doped hydroxyapatite/polylactic acid (Zn-doped HA/PLA) composite coatings were coated on stainless steel substrates using a spin-coating technique for the first time. The effects of heat treatment in air at 600 °C on the composition and morphology of Zn-doped HA/PLA composite coatings with a series of molar ratios of zinc (0 mol%, 5 mol%, 10 mol%, 15 mol% and 20 mol%) were studied. The obtained samples were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that Zn 2 + ions had replaced the partial Ca 2 + ions and were doped into hydroxyapatite lattice successfully. The synthetic hydroxyapatite nanoparticles showed rod-like morphology, whereas the substitution of the Zn ions restrained the growth of Zn-doped HA crystal and decreased its size. The surface morphology of Zn-doped HA/PLA composite coatings after sintering at 600 °C for 1 h exhibited a uniform, porous structure with a thickness of 60 μm or so. The introduction of PLA in composite coatings could keep metal substrates from catalyzing the decomposition of HA caused by high temperature heat treatment.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
·
2020
·
IF 2.12
Honglong Ning,Xu Zhang,Shuang Wang,Rihui Yao,Xianzhe Liu,Danqing Hou,Qiannan Ye,JinXiong Li,Jiangxia Huang,Xiuhua Cao,Junbiao Peng
SnO x films were prepared by sol-gel spin coating technology on glass substrates at low temperature. Through the optimization of the solution process, the quality of the film was effectively improved. And the effects of rotating speed, substrate pretreatment and precursor concentration and other parameters on the films were emphatically discussed. It is found that the formation of the impurity particles and holes can be reduced and the film roughness can be decreased by treating the substrate with plasma. Adding a low-speed spin coating process before high-speed spin coating can significantly reduce the roughness of film. The roughness of film decreases, and the edge shrinkage phenomenon of film is improved with the increasing spin-coating speed. The thickness of the film increases linearly with the solution concentration, but the high concentration of precursor is easy to lead to the cracks of films. Based on the optimized solution process, SnO x films with flat, smooth surface (Rq = 0.25 nm) and high transparency (visible light transmittance >90%) can be prepared at low temperature, which is expected to be used in devices based on transparent films.
研究领域:
材料科学
·
薄膜技术
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DOI
高影响因子
Aggregate
·
2024
·
IF 13.9
Zhenxin Yang,Jiale Su,Junzhan Wang,Xuanhe Li,Fushun Li,Juntao Hu,Nan Chen,Zhang Tao,Delong Yang,Deng-Ke Wang,Qiang Zhu,Yuhui Liao,Zheng-Hong Lu
Solution coating of organic semiconductors offers great potential for achieving low-cost and high-throughput manufacturing of large-area and flexible electronics. However, the solution processability of semiconducting small molecules for fabricating uniform and reliable thin-film devices poses challenges due to the low viscosities of small-molecule solutions. Here, we report a universal approach employing a primer template (PT) to enhance the spreadability of small-molecule solutions on silicon wafers, enabling the spin-coating fabrication of uniform thin films composed of millimeter-scale grains with complete large-area coverage and well-ordered molecular packing. Using PT, we fabricated organic thin-film transistors (OTFTs) using solutions containing various small molecules such as rubrene and 2-decyl-7-phenyl-[1]benzothieno[3,2-b][1]benzothiophene. The device yield of all fabricated OTFTs is consistently 100% while achieving a high average mobility of 1.62 cm 2 V −1 s −1 with a device-to-device variation of 7.7% measured in ambient air condition. In addition, the utilization of PT resulted in a batch-to-batch variation of 12.5% in device performance over dozens of OTFT devices. The key industrial manufacturing metrics, such as device yield, reproducibility, and performance uniformity of the PT OTFTs, are among the best for devices fabricated using solution spin-coating techniques.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）