期刊
ACS OMEGA
卷 6, 期 27, 页码 17545-17554出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.1c02029
关键词
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资金
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [765378]
- Academy of Finland [318913]
This study successfully deposited PEDOT films using oxidative molecular layer deposition (oMLD) technique with 3,4-ethylenedioxythiophene (EDOT) and rhenium pentachloride (ReCl5). The deposited films were transparent in the visible region and showed relatively high electrical conductivities.
Because of its high conductivity and intrinsic stability, poly(3,4-ethylenedioxythiophene (PEDOT) has gained great attention both in academic research and industry over the years. In this study, we used the oxidative molecular layer deposition (oMLD) technique to deposit PEDOT from 3,4-ethylenedioxythiophene (EDOT) and a new inorganic oxidizing agent, rhenium pentachloride (ReCl5). We extensively characterized the properties of the films by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), Raman, and conductivity measurements. The oMLD of polymers is based on the sequential adsorption of the monomer and its oxidation-induced polymerization. However, oMLD has been scarcely used because of the challenge of finding a suitable combination of volatile, reactive, and stable organic monomers applicable at high temperatures. ReCl5 showed promising properties in oMLD because it has high thermal stability and high oxidizing ability for EDOT. PEDOT films were deposited at temperatures of 125-200 degrees C. EDS and XPS measurements showed that the as-deposited films contained residues of rhenium and chlorine, which could be removed by rinsing the films with deionized water. The polymer films were transparent in the visible region and showed relatively high electrical conductivities within the 2-2000 S cm(-1) range.
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