文献类型：期刊文献

英文题名：Influences of Polymer Residues on the Growth Properties of Pentacene Thin Film on Graphene Substrates

作者：Shi, Bi-Yun[1];Dou, Wei-Dong[1,2];Tang, Jian-Xin[2]

机构：[1]Shaoxing Univ, Phys Dept, Shaoxing 312000, Peoples R China;[2]Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Peoples R China

年份：2018

卷号：122

期号：10

起止页码：5606

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：SCI-EXPANDED(收录号：WOS:000428003300041)、、EI(收录号：20181204927430)、Scopus(收录号：2-s2.0-85044098880)、WOS

基金：The work described in this paper was supported by grants from the National Natural Science Foundation of China (NSFC Grant Nos. 61474077 and 11404215).

语种：英文

外文关键词：Acetone - Esters - Film growth - Geometry - Graphite electrodes - Substrates - Surface analysis - Thin films

外文摘要：Understanding of the growth properties of organic thin film (OTF) on graphene surface is beneficial to develop high-performance organic electronic devices based on OTF and graphene electrodes. In this work, we investigated the growth behaviors of pentacene on the poly(methyl methacrylate) (PMMA)assisted wet-transfer graphene substrates. Especially, the influence of PMMA residues and graphene wrinkles on the initial nucleation behavior and subsequent aggregation of pentacene were studied in detail. Pentacene adopts standing-up geometry on the as-transferred graphene substrates. The molecules prefer to initially reside beside graphene wrinkles where the density of PMMA residues is found to be larger than the flat regions of graphene and then the subsequent deposited pentacene was packed face-to-face and developed into one-dimensional fiberlike domains with a fiber length of few micrometers. Controlled experiments and detailed surface analysis of graphene reveal that the hydroxyl groups of polymer residues are responsible for the standing-up geometry of pentacene on PMMA graphene. This emphasizes the importance to prepare clean graphene surface for layer-by-layer growth of pentacene with a lying-down geometry. Unfortunately, the complete removal of PMMA using acetone is not possible. Higher temperature may partially remove PMMA residue, but the decomposed radicals especially the hydroxyl radical induce standing-up geometry of pentacene, resulting in the coexistence of standing-up and lying-down molecular geometry for pentacene film deposited onto annealed graphene substrates.