Electric Field-Induced Chemical Surface-Enhanced Raman Spectroscopy from Aligned Peptide Nanotube–Graphene Oxide Templates for Universal Trace Detection of Biomolecules

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Title: Electric Field-Induced Chemical Surface-Enhanced Raman Spectroscopy from Aligned Peptide Nanotube–Graphene Oxide Templates for Universal Trace Detection of Biomolecules
Authors: Almohammed, Sawsan
Zhang, Fengyuan
Rodriguez, Brian J.
Rice, James H.
Permanent link: http://hdl.handle.net/10197/10144
Date: 29-Mar-2019
Online since: 2019-04-25T07:23:11Z
Abstract: Semiconductor-graphene oxide-based surface-enhanced Raman spectroscopy substrates represent a new frontier in the field of surface-enhanced Raman spectroscopy (SERS). However, the application of graphene oxide has had limited success because of the poor Raman enhancement factors that are achievable in comparison to noble metals. In this work, we report chemical SERS enhancement enabled by the application of an electric field (10-25 V/mm) to aligned semiconducting peptide nanotube-graphene oxide composite structures during Raman measurements. The technique enables nanomolar detection sensitivity of glucose and nucleobases with up to 10-fold signal enhancement compared to metal-based substrates, which, to our knowledge, is higher than that previously reported for semiconductor-based SERS substrates. The increased Raman scattering is assigned to enhanced charge-transfer resonance enabled by work function lowering of the peptide nanotubes. These results provide insight into how semiconductor organic peptide nanotubes interact with graphene oxide, which may facilitate chemical biosensing, electronic devices, and energy-harvesting applications.
Funding Details: European Commission Horizon 2020
Science Foundation Ireland
Type of material: Journal Article
Publisher: ACS
Journal: The Journal of Physical Chemistry Letters
Volume: 10
Issue: 8
Start page: 1878
End page: 1887
Copyright (published version): 2019 American Chemical Society
DOI: 10.1021/acs.jpclett.9b00436
Language: en
Status of Item: Peer reviewed
Appears in Collections:Conway Institute Research Collection
Physics Research Collection

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