当前位置: X-MOL 学术Soft Matter › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Influence of surfactants of different nature and chain length on the morphology, thermal stability and sheet resistance of graphene†
Soft Matter ( IF 2.9 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1039/c8sm01017j
Ana M. Díez-Pascual 1, 2, 3, 4, 5 , Cristina Vallés 6, 7, 8, 9 , Rocío Mateos 1, 2, 3, 4, 5 , Soledad Vera-López 1, 2, 3, 4, 5 , Ian A. Kinloch 6, 7, 8, 9 , María Paz San Andrés 1, 2, 3, 4, 5
Affiliation  

The effects of surfactants of different nature (anionic, cationic and non-ionic) and chain length on the morphology, microstructure, thermal stability and electrical resistivity of liquid exfoliated graphene (G) were investigated. Microscopic (SEM and AFM) observations revealed that the thickness of G in the dispersions depended on the surfactant nature: non-ionic surfactants rendered the highest level of exfoliation, whilst dispersions in the cationic ones exhibited fully-covered thicker sheets; the flake thickness increased with increasing surfactant chain length. X-ray diffraction studies indicated an increased interlamellar G spacing with increasing surfactant content. Raman spectra showed an increase in the ID/IG ratio with decreasing G loading. Larger upshifts of the G, 2D and D + G bands were found with increasing surfactant concentration, particularly for dispersions in the cationic surfactants. For the same G/surfactant weight ratio, the electrical resistivity of the dispersions followed the order: cationic > non-ionic > anionic, consistent with the amount of surfactant adsorbed onto G calculated via TGA. It is demonstrated herein that the thermal and electrical properties of liquid exfoliated G can be tuned by varying the surfactant concentration, nature and chain length, which is of great importance for numerous applications like solar power harvesting, high-temperature devices and flexible nanoelectronics.

中文翻译:

不同性质和链长的表面活性剂对石墨烯的形貌,热稳定性和薄层电阻的影响

研究了不同性质(阴离子,阳离子和非离子)和链长的表面活性剂对液体剥落石墨烯(G)的形貌,微观结构,热稳定性和电阻率的影响。显微镜(SEM和AFM)观察表明,分散体中G的厚度取决于表面活性剂的性质:非离子表面活性剂的剥落程度最高,而阳离子表面活性剂的分散体则表现出完全覆盖的较厚片状。薄片厚度随表面活性剂链长度的增加而增加。X射线衍射研究表明,随着表面活性剂含量的增加,层间G间距增加。拉曼光谱显示I D / I G增加G负荷降低的比率。随着表面活性剂浓度的增加,特别是对于阳离子表面活性剂中的分散体,发现G,2D和D + G带的较大升移。对于相同的G /表面活性剂重量比,分散体的电阻率遵循以下顺序:阳离子>非离子>阴离子,与通过TGA计算的吸附到G上的表面活性剂的量一致。本文证明,可以通过改变表面活性剂的浓度,性质和链长来调节液体剥落的G的热和电性能,这对于太阳能采集,高温设备和柔性纳米电子等众多应用而言非常重要。
更新日期:2018-06-25
down
wechat
bug