Influence of surfactants of different nature and chain length on the morphology, thermal stability and sheet resistance of graphene†,Soft Matter

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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 I_D/I_G 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

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