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.
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Accused Products
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.
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Citations
22 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for sensing arsenic, comprising:
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a surface-enhanced Raman spectroscopy substrate; the substrate comprising at least one high density monolayers of differently shaped polyhedral silver nanocrystals; wherein each of the nanocrystals comprise a layer of polyvinypyrrolidone (PVP) on its surface. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A sensor for sensing arsenic prepared by a process comprising the steps of:
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providing a substrate; forming at least one layer of polyhedral silver nanocrystals on the substrate; at least one said layer comprising a nanocrystal monolayer having an exposed silver surface; and exposing the silver surface of the nanocrystal layer to an analyte solution of polyvinypyrrolidone (PVP); wherein said analyte solution facilitates the binding of both arsenate and arsenite near the exposed silver surface. - View Dependent Claims (19, 20, 21, 22)
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Specification