Work

Sustainable carbon dot-based fluorosensor integrated with a microcontroller-driven portable device for on-site nanomolar detection of picric acid

Year: 2025

Type: article

Abstract: a sustainable, hydrothermal green synthesis route, free of toxic reagents or additives. The resulting water-soluble carbon dots (W-CDs) exhibit strong cyan fluorescence under UV light with a high quantum yield of 29%. Comprehensive characterizations using FTIR, XRD, HRTEM, Raman, XPS, UV-Vis, steady-state, and time-resolved fluorescence spectroscopy, confirmed their structural, morphological, and optical properties. These W-CDs serve as an effective "turn-off" fluorescent probe for PA, achieving an ultra-low detection limit of 4.17 nM in aqueous solution. The integration of W-CDs into a portable device enables real-time, on-site detection, with results closely matching standard laboratory measurements. Selectivity studies confirmed minimal interference from other analytes in complex samples. Additionally, an AND logic gate was implemented using the fluorescence response, highlighting the system's potential for intelligent chemical sensing. This work demonstrates the integration of eco-friendly nanomaterial synthesis with low-cost device engineering, offering a practical platform for environmental monitoring and explosive detection.

Source: Nanoscale

DOI: 10.1039/d5nr03407h

Authors: Mallika Phull, Amjad Ali, Jobanpreet Brar, Amit Mishra, Banibrata Maity

Institution: Thapar Institute of Engineering & Technology

Language: English

Topic: Carbon and Quantum Dots Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: hybrid

Funders: Indian Institute of Technology Roorkee, Thapar Institute of Engineering and Technology, Science and Engineering Research Board