Propagative sidewall alkylcarboxylation that induces red-shifted near-IR photoluminescence in single-walled carbon nanotubes

Yin Zhang, Nicholas Valley, Alexandra H. Brozena, Yanmei Piao, Xiaoping Song, George C Schatz, Yuhuang Wang

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Semiconducting single-walled carbon nanotubes (SWCNTs) are direct band gap materials in which exciton photoluminescence (PL) occurs at the same wavelength as excitation. Here, we show that propagative sidewall alkylation can induce a new PL peak in (6,5) SWCNTs red-shifted from the E11 near-infrared exciton excitation and emission by ∼140 meV. The magnitude of the red-shift is weakly dependent on the terminal functional group. This new emission peak is relatively bright even after a high degree of functionalization because the reaction occurs by propagating outward from initial defects, creating bands of functional groups while maintaining the number of effective defect sites. Density functional theory computations suggest that the covalently attached alkyl functional groups introduce a new, optically allowed, low-lying state from which this new emission may arise. This method of shifting nanotube PL away from the bare nanotube excitation may find applications in near-infrared (IR) fluorescence imaging by allowing both excitation and emission to occur in the optically transparent window for biological tissues.

Original languageEnglish
Pages (from-to)826-830
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume4
Issue number5
DOIs
Publication statusPublished - Mar 7 2013

Fingerprint

Single-walled carbon nanotubes (SWCN)
Functional groups
Photoluminescence
carbon nanotubes
Infrared radiation
photoluminescence
Excitons
Nanotubes
excitation
nanotubes
Defects
excitons
Alkylation
Density functional theory
defects
alkylation
Energy gap
Fluorescence
red shift
Tissue

Keywords

  • Physical Processes in Nanomaterials and Nanostructures

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Propagative sidewall alkylcarboxylation that induces red-shifted near-IR photoluminescence in single-walled carbon nanotubes. / Zhang, Yin; Valley, Nicholas; Brozena, Alexandra H.; Piao, Yanmei; Song, Xiaoping; Schatz, George C; Wang, Yuhuang.

In: Journal of Physical Chemistry Letters, Vol. 4, No. 5, 07.03.2013, p. 826-830.

Research output: Contribution to journalArticle

Zhang, Yin ; Valley, Nicholas ; Brozena, Alexandra H. ; Piao, Yanmei ; Song, Xiaoping ; Schatz, George C ; Wang, Yuhuang. / Propagative sidewall alkylcarboxylation that induces red-shifted near-IR photoluminescence in single-walled carbon nanotubes. In: Journal of Physical Chemistry Letters. 2013 ; Vol. 4, No. 5. pp. 826-830.
@article{98a17ea3b5b449eab1e6da62745e31e6,
title = "Propagative sidewall alkylcarboxylation that induces red-shifted near-IR photoluminescence in single-walled carbon nanotubes",
abstract = "Semiconducting single-walled carbon nanotubes (SWCNTs) are direct band gap materials in which exciton photoluminescence (PL) occurs at the same wavelength as excitation. Here, we show that propagative sidewall alkylation can induce a new PL peak in (6,5) SWCNTs red-shifted from the E11 near-infrared exciton excitation and emission by ∼140 meV. The magnitude of the red-shift is weakly dependent on the terminal functional group. This new emission peak is relatively bright even after a high degree of functionalization because the reaction occurs by propagating outward from initial defects, creating bands of functional groups while maintaining the number of effective defect sites. Density functional theory computations suggest that the covalently attached alkyl functional groups introduce a new, optically allowed, low-lying state from which this new emission may arise. This method of shifting nanotube PL away from the bare nanotube excitation may find applications in near-infrared (IR) fluorescence imaging by allowing both excitation and emission to occur in the optically transparent window for biological tissues.",
keywords = "Physical Processes in Nanomaterials and Nanostructures",
author = "Yin Zhang and Nicholas Valley and Brozena, {Alexandra H.} and Yanmei Piao and Xiaoping Song and Schatz, {George C} and Yuhuang Wang",
year = "2013",
month = "3",
day = "7",
doi = "10.1021/jz400167d",
language = "English",
volume = "4",
pages = "826--830",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "5",

}

TY - JOUR

T1 - Propagative sidewall alkylcarboxylation that induces red-shifted near-IR photoluminescence in single-walled carbon nanotubes

AU - Zhang, Yin

AU - Valley, Nicholas

AU - Brozena, Alexandra H.

AU - Piao, Yanmei

AU - Song, Xiaoping

AU - Schatz, George C

AU - Wang, Yuhuang

PY - 2013/3/7

Y1 - 2013/3/7

N2 - Semiconducting single-walled carbon nanotubes (SWCNTs) are direct band gap materials in which exciton photoluminescence (PL) occurs at the same wavelength as excitation. Here, we show that propagative sidewall alkylation can induce a new PL peak in (6,5) SWCNTs red-shifted from the E11 near-infrared exciton excitation and emission by ∼140 meV. The magnitude of the red-shift is weakly dependent on the terminal functional group. This new emission peak is relatively bright even after a high degree of functionalization because the reaction occurs by propagating outward from initial defects, creating bands of functional groups while maintaining the number of effective defect sites. Density functional theory computations suggest that the covalently attached alkyl functional groups introduce a new, optically allowed, low-lying state from which this new emission may arise. This method of shifting nanotube PL away from the bare nanotube excitation may find applications in near-infrared (IR) fluorescence imaging by allowing both excitation and emission to occur in the optically transparent window for biological tissues.

AB - Semiconducting single-walled carbon nanotubes (SWCNTs) are direct band gap materials in which exciton photoluminescence (PL) occurs at the same wavelength as excitation. Here, we show that propagative sidewall alkylation can induce a new PL peak in (6,5) SWCNTs red-shifted from the E11 near-infrared exciton excitation and emission by ∼140 meV. The magnitude of the red-shift is weakly dependent on the terminal functional group. This new emission peak is relatively bright even after a high degree of functionalization because the reaction occurs by propagating outward from initial defects, creating bands of functional groups while maintaining the number of effective defect sites. Density functional theory computations suggest that the covalently attached alkyl functional groups introduce a new, optically allowed, low-lying state from which this new emission may arise. This method of shifting nanotube PL away from the bare nanotube excitation may find applications in near-infrared (IR) fluorescence imaging by allowing both excitation and emission to occur in the optically transparent window for biological tissues.

KW - Physical Processes in Nanomaterials and Nanostructures

UR - http://www.scopus.com/inward/record.url?scp=84874835701&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84874835701&partnerID=8YFLogxK

U2 - 10.1021/jz400167d

DO - 10.1021/jz400167d

M3 - Article

AN - SCOPUS:84874835701

VL - 4

SP - 826

EP - 830

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 5

ER -