TY - JOUR
T1 - Plasmonic-Enhanced Cholesteric Films
T2 - Coassembling Anisotropic Gold Nanorods with Cellulose Nanocrystals
AU - Cheng, Zheng
AU - Ma, Yi
AU - Yang, Lin
AU - Cheng, Feng
AU - Huang, Zhongjie
AU - Natan, Avi
AU - Li, Hongyan
AU - Chen, Yong
AU - Cao, Daxian
AU - HUANG, Jeffery
AU - Wang, Yu Huang
AU - Liu, Yongmin
AU - Yang, Rendang
AU - Zhu, Hongli
N1 - Funding Information:
Z.C. and Y.M. contributed equally to this work. H.L.Z. acknowledges the financial Start-up support and Tier 1 support from Northeastern University. Y.M.L. acknowledges the financial support of National Science Foundation under grant number DMR-1654192. Z.C. would like to thank the China Scholarship Council (CSC) for its financial support. The authors thank the Kostas Research Institute at Northeastern University for the use of facilities. F.C. conducted the POM characterizations and analyzed the results. L.Y. and Z.F.H. conducted and analyzed part of the CD characterizations. Z.J.H. performed the UV–vis absorption and fluorescence spectroscopy measurements. All the authors contributed to writing the manuscript.
Funding Information:
Z.C. and Y.M. contributed equally to this work. H.L.Z. acknowledges the financial Start-up support and Tier 1 support from Northeastern University. Y.M.L. acknowledges the financial support of National Science Foundation under grant number DMR-1654192. Z.C. would like to thank the China Scholarship Council (CSC) for its financial support. The authors thank the Kostas Research Institute at Northeastern University for the use of facilities. F.C. conducted the POM characterizations and analyzed the results. L.Y. and Z.F.H. conducted and analyzed part of the CD characterizations. Z.J.H. performed the UV?vis absorption and fluorescence spectroscopy measurements. All the authors contributed to writing the manuscript.
PY - 2019/5/3
Y1 - 2019/5/3
N2 - Incorporating photonic crystals with nanoplasmonic building blocks gives rise to novel optoelectronic properties that promise designing advanced multifunctional materials and electronics. Herein, the free-standing chiral plasmonic composite films are designed by coassembling anisotropic plasmonic gold nanorods (GNRs) and rod-like cellulose nanocrystals (CNCs). The effects of surface charge and concentration of the GNRs on the structure and optical properties of the CNC/GNR films are examined within this study. The CNC/GNR hybrid films retain the photonic characteristic of the CNCs host while concomitantly possessing the plasmonic resonance of GNRs. The negatively charged GNRs distribute uniformly in the layered CNCs host, inducing strong electrostatic repulsion among the CNCs and thus promoting the formation of a larger helical pitch than the case without GNRs. The positively charged GNRs decrease the chiroptical activity in the composite films with increasing the concentration of GNR, which is confirmed by the circular dichroism spectra. Notably, the surface plasmon resonances of GNRs enhance the fluorescence emission, which has been demonstrated by surface-enhanced fluorescence signals in this work. This study sheds light on fabricating functional chiral plasmonic composite films with enhanced chiral plasmonics by utilizing CNCs as a dynamic chiral nematic template and adjusting surface charges.
AB - Incorporating photonic crystals with nanoplasmonic building blocks gives rise to novel optoelectronic properties that promise designing advanced multifunctional materials and electronics. Herein, the free-standing chiral plasmonic composite films are designed by coassembling anisotropic plasmonic gold nanorods (GNRs) and rod-like cellulose nanocrystals (CNCs). The effects of surface charge and concentration of the GNRs on the structure and optical properties of the CNC/GNR films are examined within this study. The CNC/GNR hybrid films retain the photonic characteristic of the CNCs host while concomitantly possessing the plasmonic resonance of GNRs. The negatively charged GNRs distribute uniformly in the layered CNCs host, inducing strong electrostatic repulsion among the CNCs and thus promoting the formation of a larger helical pitch than the case without GNRs. The positively charged GNRs decrease the chiroptical activity in the composite films with increasing the concentration of GNR, which is confirmed by the circular dichroism spectra. Notably, the surface plasmon resonances of GNRs enhance the fluorescence emission, which has been demonstrated by surface-enhanced fluorescence signals in this work. This study sheds light on fabricating functional chiral plasmonic composite films with enhanced chiral plasmonics by utilizing CNCs as a dynamic chiral nematic template and adjusting surface charges.
KW - cellulose nanocrystals
KW - chiral nematic structures
KW - chiral plasmonic films
KW - chiroptical activity
KW - gold nanorod
KW - surface-enhanced fluorescence
UR - http://www.scopus.com/inward/record.url?scp=85061799321&partnerID=8YFLogxK
U2 - 10.1002/adom.201801816
DO - 10.1002/adom.201801816
M3 - Journal article
AN - SCOPUS:85061799321
SN - 2195-1071
VL - 7
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 9
M1 - 1801816
ER -