Tu-CHS-09 - AuAg Nanocage-based Colorimetric Sensor for Silver Detection

Event

EUROSENSORS 2026
2026-09-06 - 2026-09-09
Zurich

Band

Poster

Chapter

Chemical Sensors

Author(s)

R. M. Sarza, S. F. Y. Li, X. Su - National University of Singapore,Singapore (Singapore), L. Sutarlie - Institute of Materials Research and Engineering,Singapore (Singapore)

Pages

435 - 436

DOI

10.5162/eurosensors2026/Tu-CHS-09

ISBN

978-3-910600-12-6

Price

free

Abstract

Silver ions (Ag ⁺ ) are toxic heavy metal pollutants released from industrial wastewater, agricultural runoff, and antimicrobial applications. Existing field-deployable detection tools lack sufficient sensitivity for regulatory thresholds. This work presents a paper-based colorimetric sensor using AuAg nanocages as the sensing material. In the presence of Ag ⁺ , ascorbic acid catalyzes Ag⁰ deposition on the inner walls of the nanocages, causing a blue shift in the localized surface plasmon resonance (LSPR) and a visible color change. Currently optimized on Whatman 3 filter paper at 70% nanocage loading, the sensor now achieves a linear response from 5 to 45 ppm (R² = 0.990) and a visual detection limit of 1 ppm, without requiring additional reagents, substrates, or instrumentation.