TY - JOUR
T1 - In Situ Electrochemical Tip-Enhanced Raman Spectroscopy with a Chemically Modified Tip
AU - Goubert, Guillaume
AU - Chen, Xu
AU - Jiang, Song
AU - Van Duyne, Richard P.
N1 - Funding Information:
We gratefully acknowledge financial support from the Air Force Office of Scientific Research MURI (FA9550-14-1-0003). We thank Dr. Allen J. Bard, Dr. Henry White, Dr. Martin Edwards, Dr. Michael Mattei, and Dr. Katherine A. Willets for helpful discussions.
Publisher Copyright:
Copyright © 2018 American Chemical Society.
PY - 2018/7/19
Y1 - 2018/7/19
N2 - Chemically modified tips in scanning tunneling microscopy (STM) and atomic force microscopy (AFM) have been used to improve the imaging resolution or provide richer chemical information, mostly in ultrahigh vacuum (UHV) environments. Tip-enhanced Raman spectroscopy (TERS) is a nanoscale spectroscopic technique that already provides chemical information and can provide subnanometer spatial resolution. Chemical modification of TERS tips has mainly been focused on increasing their lifetimes for ambient and in situ experiments. Under UHV conditions, chemical functionalization has recently been carried out to increase the amount of chemical information provided by TERS. However, this strategy has not yet been extended to in situ electrochemical (EC)-TERS studies. The independent control of the tip and sample potentials offered by EC-STM allows us to prove the in situ functionalization of a tip in EC-STM-TERS. Additionally, the Raman response of chemically modified TERS tips can be switched on and off at will, which makes EC-STM-TERS an ideal platform for the development of in situ chemical probes on the nanoscale.
AB - Chemically modified tips in scanning tunneling microscopy (STM) and atomic force microscopy (AFM) have been used to improve the imaging resolution or provide richer chemical information, mostly in ultrahigh vacuum (UHV) environments. Tip-enhanced Raman spectroscopy (TERS) is a nanoscale spectroscopic technique that already provides chemical information and can provide subnanometer spatial resolution. Chemical modification of TERS tips has mainly been focused on increasing their lifetimes for ambient and in situ experiments. Under UHV conditions, chemical functionalization has recently been carried out to increase the amount of chemical information provided by TERS. However, this strategy has not yet been extended to in situ electrochemical (EC)-TERS studies. The independent control of the tip and sample potentials offered by EC-STM allows us to prove the in situ functionalization of a tip in EC-STM-TERS. Additionally, the Raman response of chemically modified TERS tips can be switched on and off at will, which makes EC-STM-TERS an ideal platform for the development of in situ chemical probes on the nanoscale.
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U2 - 10.1021/acs.jpclett.8b01635
DO - 10.1021/acs.jpclett.8b01635
M3 - Article
C2 - 29945445
AN - SCOPUS:85049263830
SN - 1948-7185
VL - 9
SP - 3825
EP - 3828
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 14
ER -