Surface-enhanced raman spectroscopy substrate for arsenic sensing in groundwater
US9057705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2009 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | Aug 16, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D62/122
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.