TY - JOUR
T1 - Optical Voltammetry of Polymer-Encapsulated Single-Walled Carbon Nanotubes
AU - Horoszko, Christopher P.
AU - Jena, Prakrit V.
AU - Roxbury, Daniel
AU - Rotkin, Slava V.
AU - Heller, Daniel A.
N1 - Funding Information:
This work was supported in part by the National Science Foundation CAREER Award (1752506), the NIH New Innovator Award (DP2-HD075698), NIDDK (R01DK114321-01A1), NCI (R01CA215719-02), the Cancer Center Support Grant (P30 CA008748), the Pershing Square Sohn Cancer Research Alliance, the Honorable Tina Brozman Foundation for Ovarian Cancer Research, the Expect Miracles Foundation Financial Services Against Cancer, the Anna Fuller Fund, the Louis V. Gerstner Jr. Young Investigator’s Fund, the Frank A. Howard Scholars Program, MSK’s Cycle for Survival’s Equinox Innovation Award in Rare Cancers, the Alan and Sandra Gerry Metastasis Research Initiative, Mr. William H. Goodwin and Mrs. Alice Goodwin and the Commonwealth Foundation for Cancer Research, the Experimental Therapeutics Center, the Imaging & Radiation Sciences Program, and the Center for Molecular Imaging and Nanotechnology of Memorial Sloan Kettering Cancer Center. D.R. was supported in part by the American Cancer Society Roaring Fork Valley Postdoctoral Fellowship (PF-13-388801-TBG) as well as a National Science Foundation CAREER Award (1844536); S.V.R. acknowledges NSF support (ECCS-1509786). The authors thank Karla H. Gioia, Januka Budhathoki-Uprety, Rahul V. Rao-Pothuraju, Peter Schnatz, Richard Martel, and Justin R. Cross of the Donald B. and Catherine C. Marron Cancer Metabolism Center of Memorial Sloan Kettering Cancer Center for discussions and technical assistance.
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/10/3
Y1 - 2019/10/3
N2 - The semiconducting single-walled carbon nanotube (SWCNT), noncovalently wrapped by a polymeric monolayer, is a nanoscale semiconductor-electrolyte interface under investigation for sensing, photonics, and photovoltaic applications. SWCNT complexes are routinely observed to sensitize various electrochemical/redox phenomena, even in the absence of an external field. While the photoluminescence response to gate voltage depends on the redox potential of the nanotube, analogous optical voltammetry of functionalized carbon nanotubes could be conducted in suspension without applying voltage but by varying the solution conditions as well as the chemistry of the encapsulating polymer. Steady-state photoluminescence, absorbance, and in situ measurements of O2/H2O reactivity show correlation with the pH/pKa-dependent reactivity of π-rich coatings. The nanotube emission responses suggest that the presence of photogenerated potential may explain the observed coating electrochemical reactivity. This work finds that electronic and chemical interactions of the nanotube with the encapsulating polymer may play a critical role in applications that depend on radiative recombination, such as optical sensing.
AB - The semiconducting single-walled carbon nanotube (SWCNT), noncovalently wrapped by a polymeric monolayer, is a nanoscale semiconductor-electrolyte interface under investigation for sensing, photonics, and photovoltaic applications. SWCNT complexes are routinely observed to sensitize various electrochemical/redox phenomena, even in the absence of an external field. While the photoluminescence response to gate voltage depends on the redox potential of the nanotube, analogous optical voltammetry of functionalized carbon nanotubes could be conducted in suspension without applying voltage but by varying the solution conditions as well as the chemistry of the encapsulating polymer. Steady-state photoluminescence, absorbance, and in situ measurements of O2/H2O reactivity show correlation with the pH/pKa-dependent reactivity of π-rich coatings. The nanotube emission responses suggest that the presence of photogenerated potential may explain the observed coating electrochemical reactivity. This work finds that electronic and chemical interactions of the nanotube with the encapsulating polymer may play a critical role in applications that depend on radiative recombination, such as optical sensing.
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U2 - 10.1021/acs.jpcc.9b07626
DO - 10.1021/acs.jpcc.9b07626
M3 - Article
C2 - 32690989
AN - SCOPUS:85073101790
SN - 1932-7447
VL - 123
SP - 24200
EP - 24208
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 39
ER -
