%0 Journal Article %1 WOS:000656994100057 %A Nascimento, Viviane V %A Neves, Wellington Q %A Alencar, Rafael S %A Li, Guanghui %A Fu, Chengyin %A Haddon, Robert C %A Bekyarova, Elena %A Guo, Juchen %A Alexandre, Simone S %A Nunes, Ricardo W %A Filho, Antonio G Souza %A Fantini, Cristiano %C 1155 16TH ST, NW, WASHINGTON, DC 20036 USA %D 2021 %I AMER CHEMICAL SOC %J ACS NANO %K 1D Raman carbon chains; electronic endohedral excited functionalization} hybrid nanotubes; scattering; states; sulfur systems; {resonance %N 5 %P 8574-8582 %R 10.1021/acsnano.1c00390 %T Origin of the Giant Enhanced Raman Scattering by Sulfur Chains Encapsulated inside Single-Wall Carbon Nanotubes %V 15 %X 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.

@article{WOS:000656994100057, 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.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, author = {Nascimento, Viviane V and Neves, Wellington Q and Alencar, Rafael S and Li, Guanghui and Fu, Chengyin and Haddon, Robert C and Bekyarova, Elena and Guo, Juchen and Alexandre, Simone S and Nunes, Ricardo W and Filho, Antonio G Souza and Fantini, Cristiano}, biburl = {https://www.bibsonomy.org/bibtex/22d020150d97c5baf5ad6ba61800dbc7f/ppgfis_ufc_br}, doi = {10.1021/acsnano.1c00390}, interhash = {c72ad26f449682715a53062bba3a7980}, intrahash = {2d020150d97c5baf5ad6ba61800dbc7f}, issn = {1936-0851}, journal = {ACS NANO}, keywords = {1D Raman carbon chains; electronic endohedral excited functionalization} hybrid nanotubes; scattering; states; sulfur systems; {resonance}, number = 5, pages = {8574-8582}, publisher = {AMER CHEMICAL SOC}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Origin of the Giant Enhanced Raman Scattering by Sulfur Chains Encapsulated inside Single-Wall Carbon Nanotubes}, tppubtype = {article}, volume = 15, year = 2021 }