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Title: Method of evaluating pH using an inorganic-oxide nanoparticle based optical pH sensor

Abstract

A method for evaluating the pH of an aqueous solution by utilizing the optical properties of a pH sensing material includes optically active nanoparticles fixed to a substrate. The optically active nanoparticles have a localized refractive index modulation over a pH range from 2.0 to 12.0 of at least 1% and, where the plurality of optically active nanoparticles have an average nanoparticle diameter of less than about 500 nanometers. The method includes contacting the pH sensing material with the aqueous solution, illuminating the pH sensing material, and monitoring an optical signal generated through comparison of incident light and exiting light to determine the optical transmission, absorption, reflection, and/or scattering of the pH sensitive material. The optical signal of the pH sensitive material varies in response to the pH of the aqueous solution, providing a means by which the pH and any changes in the pH may be analyzed.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
U.S. Dept. of Energy, Washington, DC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1568271
Patent Number(s):
10,274,431
Application Number:
15/098,714
Assignee:
U.S. Department of Energy (Washington, DC)
Resource Type:
Patent
Resource Relation:
Patent File Date: 04/14/2016
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Kauffman, Douglas, Matranga, Christopher, Ohodnicki, Jr., Paul R., Su, Xin, and Wang, Congjun. Method of evaluating pH using an inorganic-oxide nanoparticle based optical pH sensor. United States: N. p., 2019. Web.
Kauffman, Douglas, Matranga, Christopher, Ohodnicki, Jr., Paul R., Su, Xin, & Wang, Congjun. Method of evaluating pH using an inorganic-oxide nanoparticle based optical pH sensor. United States.
Kauffman, Douglas, Matranga, Christopher, Ohodnicki, Jr., Paul R., Su, Xin, and Wang, Congjun. Tue . "Method of evaluating pH using an inorganic-oxide nanoparticle based optical pH sensor". United States. https://www.osti.gov/servlets/purl/1568271.
@article{osti_1568271,
title = {Method of evaluating pH using an inorganic-oxide nanoparticle based optical pH sensor},
author = {Kauffman, Douglas and Matranga, Christopher and Ohodnicki, Jr., Paul R. and Su, Xin and Wang, Congjun},
abstractNote = {A method for evaluating the pH of an aqueous solution by utilizing the optical properties of a pH sensing material includes optically active nanoparticles fixed to a substrate. The optically active nanoparticles have a localized refractive index modulation over a pH range from 2.0 to 12.0 of at least 1% and, where the plurality of optically active nanoparticles have an average nanoparticle diameter of less than about 500 nanometers. The method includes contacting the pH sensing material with the aqueous solution, illuminating the pH sensing material, and monitoring an optical signal generated through comparison of incident light and exiting light to determine the optical transmission, absorption, reflection, and/or scattering of the pH sensitive material. The optical signal of the pH sensitive material varies in response to the pH of the aqueous solution, providing a means by which the pH and any changes in the pH may be analyzed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

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Works referenced in this record:

Plasmonic transparent conducting metal oxide nanoparticles and films for optical sensing applications
patent, January 2014