Patent ID: 9470722
Filing Date: 2016-10-18
CPC Classification: B82Y,G01R

Claim Text:
1. A method for measuring electric potential difference, the method comprising: providing an object comprising a first region and a second region spaced from the first region, wherein an unknown electric potential difference U exists between the first region and the second region; placing a first carbon nanotube composite layer on the object, wherein the first carbon nanotube composite layer is electrically connected to the first region and the second region; irradiating the first carbon nanotube composite layer with a Raman-laser to measure a characteristic band frequency value Y* of Raman-spectra of the first carbon nanotube composite layer under the unknown electric potential difference U; and obtaining a value of the unknown electric potential difference U from formula U=(Y*−b)/a, wherein a and b are two constants.