Sensor having a color-changeable sensory surface
US8673237B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Aug 5, 2010 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | Oct 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/54373
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a sensor having a color-changeable sensory surface, characterized in that at least one molecular layer of a positively charged polymer (4) is bonded to a further molecular layer of a negatively charged polymer (5) in alternation by means of ionic forces, wherein a solvent is stored in the charged polymer layers (4, 5), whereby the polymer layers swell at least 10%, and colored, preferably metal or semiconducting nanoparticles (6) are bonded to the last charged polymer molecular layer, and the total layer thickness of the inert intermediate layer (3) and all polymer layers (4, 5) is at least 40 nm but less than 500 nm so that the layer setup has an interference color that is visible to the human eye or measurable in the infrared and that can be changed by means of interaction with an analyte, the interference color being caused by optical interference between the material surface (2) and the layer of the nanoparticles (6).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.