Phone Camera Nano-Biosensor Using Mighty Sensitive Transparent Reusable Upconversion Paper
Kamaljit Kaur, Bandana Kumari Sahu, Kanchan Swami, Mahima Chandel, Anshika Gupta, Li‐Hua Zhu, Jeffrey P. Youngblood, Selvaraju Kanagarajan, Vijayakumar Shanmugam
Abstract
UCNPs, which shows an intense emission at 475 nm, has been developed. This strip has been found to be sensitive to lycopene with a detection limit as low as 10 nM using a smartphone camera, which is due to static quenching that is confirmed by the lifetime study. In comparison to previous paper strips, here the transparent strip has minimal scattering with maximum sensitivity in spite of not using any metal quenchers. An increase in strip hydrophobicity during the fabrication process complements the strip to selectively permeate and present an extraction-free substitute analysis for chromatography. Hydrophobicity endows the strip with the capability to reuse the strip with ∼100% luminescence recovery.