TY - JOUR
T1 - On the study of electrochromism in multiwalled carbon nanotube-polydiacetylene composites
AU - Hansen, Reinack Varghese
AU - Huang, Mingyue
AU - Zhan, Zhaoyao
AU - Sun, Gengzhi
AU - Yang, Jinglei
AU - Zheng, Lianxi
N1 - Funding Information:
The authors would like to acknowledge the partial financial support of this work from the Ministry of Education of Singapore (Grant No: RG15/13 ). We appreciate the helpful discussion on the Raman data with Professor Luqi Liu from the National Center for Nanoscience and Technology, Chinese Academy of Sciences, China.
Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
PY - 2015/5/16
Y1 - 2015/5/16
N2 - Multiwalled carbon nanotubes (MWCNTs) have been shown to induce electrochromism in polydiacetylene (PDA) formed from the diacetylene monomer 10,12-petacosadiynoic acid (PCDA). This study investigates changes in the backbone of both partially and highly polymerized 10,12-PCDA monomers brought about by the unique electrical transport of underlying MWCNT sheets. The real time variation in absorbance with voltage revealed a clear transition from the blue to red state in both types of composites, but the Raman peaks responded differently: Raman peaks from carbon double and triple bonds in PDA did not shift under current flow in the partially polymerized composites but shifted by 21.75 and 17.85 cm-1 respectively, in the highly polymerized composites. These results suggest that stress in the PDA backbone was not crucial for forming the red phase when electrical stimulus was involved. Polarized Raman experiments revealed significant alignment changes in the composites as a result of current flow. It is proposed that a widening of PDA band gap due to π-orbital de-stacking is the principle behind electrically induced blue to red transition in MWCNT-PDA composites.
AB - Multiwalled carbon nanotubes (MWCNTs) have been shown to induce electrochromism in polydiacetylene (PDA) formed from the diacetylene monomer 10,12-petacosadiynoic acid (PCDA). This study investigates changes in the backbone of both partially and highly polymerized 10,12-PCDA monomers brought about by the unique electrical transport of underlying MWCNT sheets. The real time variation in absorbance with voltage revealed a clear transition from the blue to red state in both types of composites, but the Raman peaks responded differently: Raman peaks from carbon double and triple bonds in PDA did not shift under current flow in the partially polymerized composites but shifted by 21.75 and 17.85 cm-1 respectively, in the highly polymerized composites. These results suggest that stress in the PDA backbone was not crucial for forming the red phase when electrical stimulus was involved. Polarized Raman experiments revealed significant alignment changes in the composites as a result of current flow. It is proposed that a widening of PDA band gap due to π-orbital de-stacking is the principle behind electrically induced blue to red transition in MWCNT-PDA composites.
UR - http://www.scopus.com/inward/record.url?scp=84929347205&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2015.04.027
DO - 10.1016/j.carbon.2015.04.027
M3 - Article
AN - SCOPUS:84929347205
SN - 0008-6223
VL - 90
SP - 222
EP - 230
JO - Carbon
JF - Carbon
ER -