Surface-enhanced raman spectroscopy substrate for arsenic sensing in groundwater
First Claim
1. A sensor, comprising:
- a substrate;
the substrate comprising at least one high-density monolayer of polyhedral silver nanocrystals;
wherein each of the nanocrystals comprise a layer of polyvinypyrrolidone (PVP) on its surface;
wherein the nanocrystals are aligned in the monolayer to have uniform interparticle spacing and directional alignment with controlled density and pitch; and
wherein the PVP layer is configured to allow for transfer of one or more chemical compounds to the high-density monolayer of polyhedral silver nanocrystals for sensing the one or more chemical compounds.
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Abstract
A surface-enhanced Raman spectroscopy (SERS) substrate formed from a plurality of monolayers of polyhedral silver nanocrystals, wherein at least one of the monolayers has polyvinypyrrolidone (PVP) on its surface, and thereby configured for sensing arsenic is described. Highly active SERS substrates are formed by assembling high density monolayers of differently shaped silver nanocrystals onto a solid support. SERS detection is performed directly on this substrate by placing a droplet of the analyte solution onto the nanocrystal monolayer. Adsorbed polymer, polyvinypyrrolidone (PVP), on the surface of the nanoparticles facilitates the binding of both arsenate and arsenite near the silver surface, allowing for highly accurate and sensitive detection capabilities.
14 Citations
11 Claims
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1. A sensor, comprising:
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a substrate; the substrate comprising at least one high-density monolayer of polyhedral silver nanocrystals; wherein each of the nanocrystals comprise a layer of polyvinypyrrolidone (PVP) on its surface; wherein the nanocrystals are aligned in the monolayer to have uniform interparticle spacing and directional alignment with controlled density and pitch; and wherein the PVP layer is configured to allow for transfer of one or more chemical compounds to the high-density monolayer of polyhedral silver nanocrystals for sensing the one or more chemical compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification