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Citation: YANG Ya-Jie, JIANG Ya-Dong, XU Jian-Hua. Preparation and Properties of Conducting Polymeric Ultrathin Films[J]. Acta Physico-Chimica Sinica, ;2007, 23(04): 484-488. doi: 10.1016/S1872-1508(07)60032-1 shu

Preparation and Properties of Conducting Polymeric Ultrathin Films

1.
State Key Laboratory of Electronic Thin Films&Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

Received Date: 29 September 2006
Available Online: 23 March 2007

A multilayer ultrathin filmof poly(3,4-ethylene dioxythiophene) (PEDOT) was first prepared by a modified Langmuir-Blodgett (LB) technique. The polymerization of EDOT monomer occured in a multilayer as-prepared LB film by exposing the filmto EDOTvapor. The formation of PEDOTparticles in the LBfilmwas confirmed by UV-Vis-near IR (UV-Vis-NIR) absorption spectrumand X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) investigation of the filmsurface exhibited small PEDOTparticles distributed in stearic acid (SA) LBfilms. Secondary ion mass spectrometry (SIMS) was employed to analyze the location of PEDOT formed and the results showed that PEDOT was well confined in the multilayer structure. A 60-layer PEDOT LB film had higher conductivity (2.6 S·cm-1) than a conventional PEDOT film, and exhibited excellent doping/dedoping characteristics. An investigation of the relationship between film conductivity and exposure time on EDOT ambience revealed that the film obtained steady conductivity after 120 min and it was concluded that the lower oxidizer density in LB film might slow the polymerization speed of EDOT. In a study of sensitive characteristics, the PEDOT film showed faster and nonlinear responses to analyte gas in a lower concentration (φ<30×10^-6), and exhibited a linear response to analyte in a higher concentration (φ=(30-120)^10-6). The result of gas sensitivity also showed that the film had excellent reversible and reproducible response to HCl vapor. The mechanismof conductivity and gas sensitivity of composite LB films were also included.
- Langmuir-Blodgett film; Conducting polymer; Conductivity; Gas sensitivity; Ultrathin film
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沈阳化工大学材料科学与工程学院沈阳 110142

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Preparation and Properties of Conducting Polymeric Ultrathin Films

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com