Abstract
The field of plasmonics has experienced rapid growth over the past decade with a host of emerging applications including single molecule sensing and plasmon-assisted catalysis. The vast majority of these applications use either silver or gold as the plasmonic metal, which are both high cost and face earth-abundance limitations in the next 100 years. Recent efforts have focused on taking advantage of the plasmonic properties of copper, a more abundant and low cost coinage metal as a sustainable route for plasmonic applications. In particular, there has been great interest in developing copper substrates capable of reliable and efficient enhancement of Raman signals for use in surface-enhanced Raman spectroscopy (SERS) sensing. Herein we describe a sequential electrodeposition technique whereby highly functional and robust Cu/Ag bimetallic SERS-active screen printed electrodes can be produced rapidly and at low cost, which display excellent plasmonic performance and are capable of supporting surface-plasmon assisted catalysis (SPAC). This modified screen printed electrode allows for the in situ spectroelectrochemical investigation of surface redox processes using a sustainable alternative to traditional monometallic electrodes.
Highlights
Characterization of electrodeposited bimetallic Cu/Ag structures.—Figure 1 shows the field emission scanning electron microscope (FE-SEM) images for the screen printed electrode after the sequential electrodeposition as described above, where 250, 500, 750 and 1000 μL of 1.0 × 10−4 M AgNO3 were added to the Cu(NO3)[2] solution for the second electrodeposition step
Since oxygen is always present in the vacuum chamber of the FE-SEM to some extent, one is unable to quantify the amount of copper oxidation using this technique
This work demonstrates the first use of sequential electrodeposition for the facile creation of SERS-active bimetallic Cu/Ag hierarchical structures directly onto carbon-based screen printed electrodes
Summary
Evaluation of an Electrodeposited Bimetallic Cu/Ag Nanostructured Screen Printed Electrode for Electrochemical Surface-Enhanced Raman Spectroscopy (EC-SERS) Investigations
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