journal article·2021-05-25

Origin of the Giant Enhanced Raman Scattering by Sulfur Chains Encapsulated inside Single-Wall Carbon Nanotubes

Viviane V. Nascimento, Wellington Q. Neves, Rafael S. Alencar, Guanghui Li, Chengyin Fu, Robert C. Haddon, Elena Bekyarova, Juchen Guo, Simone S. Alexandre, Ricardo W. Nunes, Antonio G. Souza Filho, Cristiano Fantini

ACS Nano· Volume 15· Issue 5
Publisher page

Abstract

In this work, we explain the origin and the mechanism responsible for the strong enhancement of the Raman signal of sulfur chains encapsulated by single-wall carbon nanotubes by running resonance Raman measurements in a wide range of excitation energies for two nanotube samples with different diameter distributions. The Raman signal associated with the vibrational modes of the sulfur chain is observed when it is confined by small-diameter metallic nanotubes. Moreover, a strong enhancement of the Raman signal is observed for excitation energies corresponding to the formation of excited nanotube-chain-hybrid electronic states. Our hypothesis was further tested by high pressure Raman measurements and confirmed by density functional theory calculations of the electronic density of states of hybrid systems formed by sulfur chains encapsulated by different types of single-wall carbon nanotubes.
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Research context

OpenAlex topics: Carbon Nanotubes in Composites · Fullerene Chemistry and Applications · Mechanical and Optical Resonators

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil

Departamento de Física, Universidade Federal do Ceará, Fortaleza, CE 60455-900, Brazil

Departamento de Física e Matemática, Instituto Federal de Educação, Ciência e Tecnologia do Ceará, Fortaleza, CE 60040-531, Brazil

Faculdade de Física, Universidade Federal do Pará, Belém, PA 66075-110, Brazil

Center for Nanoscale Science and Engineering, University of California, Riverside, California 92521, United States

Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, United States

Funding

Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais · Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico · Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior · National Institute of Science and Technology in Carbon Nanomaterials · Instituto Federal de Educa??o, Ci?ncia eTecnologia do Cear? IFCE

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