Abstract

Here, we report on an integrated sensor system based on InGaN heterostructures for (bio)chemical sensing. The system is compact in size and fits into a relatively small volume, which makes it versatile for many applications including liquid biomolecule and gas sensing in hospitals or doctors’ offices. A GaN-based heterostructure with an InGaN quantum well close to its surface excited by a 405 nm diode laser reacts to molecules adsorbing on the surface (quantum-confined Stark effect, QCSE) by shifting its photoluminescence (PL) emission wavelength, thus acting as a chemical sensor. The PL signal is guided to a linear wavelength selecting filter and then detected by a split Si photodiode. This simplification yields reduction in size and cost; possible limitations and challenges are discussed. Simulation calculations about the split diode detector responsiveness indicate that best results can be obtained when fitting the diode spectral resolution to the width of the PL signal of the InGaN sensor and the expected PL shift. The system's utility is applied to different analytes, such as isopropanol, ferritin and apoferritin. For ferritin, a wavelength shift sensitivity of 9.6nmmg/ml was found.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.