Tetrachloroperylene diimide functionalized reduced graphene oxide sheets and their I–V behavior by current sensing atomic force microscopy
Tetrachloroperylene diimide functionalized reduced graphene oxide sheets and their I–V behavior by current sensing atomic force microscopy
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DOI：
10.1039/c2jm34379g
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发表时间：
2012-08
影响因子：
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通讯作者：
Z. Ren;Dianming Sun;Jianming Zhang;Shouke Yan
中科院分区：
文献类型：
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作者：
Z. Ren;Dianming Sun;Jianming Zhang;Shouke Yan
通过两步法制备了用n型四氯代苝二酰亚胺（PDI）和低聚PDI共价官能化的还原氧化石墨烯（rGO）片。首先，氧化石墨烯（GO）通过与3-氨丙基二甲基乙硅烷或3-氨丙基二乙基甲硅烷的酰胺化反应进行改性，在此期间GO被热还原。然后它们通过脱水缩合与硅烷醇修饰的PDI反应以获得PDI和低聚PDI修饰的rGO（rGO-PDI和rGO-（PDI）n）。通过FTIR、拉曼光谱、X射线光电子能谱和XRD等表征手段，证实了rGO-PDI和rGO-（PDI）n的成功制备。使用AFM研究了rGO-PDI和rGO-（PDI）n片的形态。发现rGO-PDI和rGO-（PDI）n片的表面形态和高度取决于用于浇铸的溶剂，这是由于PDI的溶解度的差异。此外，rGO-PDI和rGO-（PDI）n的荧光发射光谱显示出强烈的荧光猝灭和蓝移，特别是在乙醇中。电流传感原子力显微镜（CSAFM）表明，rGO-PDI复合材料显示出相当不同的导电性和光学性能与接枝效率和不同的溶剂用于铸造。值得注意的是，与rGO-PDI相比，rGO-（PDI）n的电子电导率增加了2-3个数量级。
Reduced graphene oxide (rGO) sheets covalently functionalized with n-type tetrachloroperylene diimide (PDI) and oligomeric PDI have been prepared by a two-step approach. Firstly, graphene oxide (GO) was modified by an amidation reaction with 3-aminopropyldimethylethoxylsilane or 3-aminopropyldiethoxylmethylsilane, during which GO was reduced thermally. They then react with the silanol modified PDI by dehydration condensation to obtain PDI and oligomeric PDI modified rGO (rGO–PDI and rGO–(PDI)n). The successful preparation of rGO–PDI and rGO–(PDI)n were confirmed by FTIR, Raman, X-ray photoelectron spectroscopy and XRD. The morphologies of rGO–PDI and rGO–(PDI)n sheets were studied using AFM. It was found that surface morphologies and height of rGO–PDI and rGO–(PDI)n sheets are dependent on the solvents used for casting due to differences in the solubility of PDI. Moreover, the fluorescence emission spectrum of rGO–PDI and rGO–(PDI)n shows strong fluorescence quenching and blue shift, especially in ethanol. Current sensing atomic force microscopy (CSAFM) indicated that the rGO–PDI composite shows quite different electric conductivity and optical properties with grafting efficiency and different solvents used for casting. Significantly, the electronic conductivity of rGO–(PDI)n increased by 2–3 orders of magnitude compared to rGO–PDI.