U.S. Department of Energy

Douglas Kauffman

Christopher Matranga

Rongchao Jin

Dominic Alfonso

Paul R Ohodnicki, Jr

Paul Ohodnicki

Huifeng Qian

Congjun Wang

Rajan C Siva

Chenjie Zeng

Xin Su

Xingyi Deng

Methods for manipulating charge states of Au nanoparticles and uses for the corresponding nanoparticles are described. A preferred embodiment comprises the following steps: 1) combining at least one Au nanocluster with at least one electron accepting molecule in the presence of an excess amount of counter ion; and 2) exposing the nanocluster, electron acceptor and counter ion mixture to light creating Aunanoclusters. In one or more embodiments, an additional step of depositing the Aunanoclusters onto a catalyst support is performed.

Methods and use of manipulating Au25 charge state

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.

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

An apparatus and method for COreduction using an Auelectrode. The Auelectrode is comprised of ligand-protected Auhaving a structure comprising an icosahedral core of 13 atoms surrounded by a shell of six semi-ring structures bonded to the core of 13 atoms, where each semi-ring structure is typically &#x2014;SR&#x2014;Au&#x2014;SR&#x2014;Au&#x2014;SR or &#x2014;SeR&#x2014;Au&#x2014;SeR&#x2014;Au&#x2014;SeR. The 12 semi-ring gold atoms within the six semi-ring structures are stellated on 12 of the 20 faces of the icosahedron of the Aucore, and organic ligand &#x2014;SR or &#x2014;SeR groups are bonded to the Aucore with sulfur or selenium atoms. The Auelectrode and a counter-electrode are in contact with an electrolyte comprising COand H+, and a potential of at least &#x2212;0.1 volts is applied from the Auelectrode to the counter-electrode.

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Pittsburgh, PA, United States of America

Douglas Kauffman