期刊
ACS NANO
卷 13, 期 4, 页码 4392-4401出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b09624
关键词
chirality; electronic circular dichroism; Au nanoparticle assembly; surface plasmon resonance; thermoresponsive template; plasmon coupling
类别
资金
- Department of Science and Technology (DST Nanomission Project) [SR/NM/NS-23/2016]
- J. C. Bose National Fellowship of SERB-DST, Government of India
- University Grants Commission, Government of India
- Indo-Italian Executive Program 2017-2019 of Cooperation in Scientific & Technological Cooperation (Department of Science and Technology) [INT/Italy/P-9/2016(ER)]
- CINECA through IsC68_CANTA project
- Department of Science and Technology, Government of India
- Indian Institute of Science Education and Research Thiruvananthapuram
- Joint Science Academies' Summer Research Fellowship Programme
Template-assisted strategies are widely used to fabricate nanostructured materials. By taking these strategies a step forward, herein we report the design of two chiral plasmonic nanostructures based on Au nanoparticle (NP) assemblies organized in clockwise and anticlockwise directions, having opposite response to circularly polarized light. The chiral plasmonic nanostructures are obtained by growing Au NPs on chiral templates based on D- and L-forms of alanine functionalized phenyleneethynylenes. Interestingly, Au NP assemblies show mirror symmetrical electronic circular dichroism (ECD) bands at their surface plasmon frequency originating through their asymmetric organization. Upon increasing the temperature, the chiral templates dissociate as evident from the disappearance of their ECD signal. The profound advantage of the thermoresponsive nature of the templates is employed to obtain free-standing chiral plasmonic nanostructures. The tilt angle high-resolution transmission electron microscopic measurements indicate that the NP assemblies, grown on a template based on the D-isomer, organize in clockwise direction (P-form) and on L-isomer in anticlockwise direction (M-form). The inherent chirality prevailing on the surface of the template drives the helical growth of the Au NPs in opposite directions. Experimental results are rationalized by a model which accounts for the large polarizability of Au NPs. The large polarizability leads to large oscillating dipole moments whose effects become prominent when interparticle distances are comparable to the particle size.
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