Title: Photonic microresonator based sensor for selective nitrate ion detection

Journal Article · · Sensors and Actuators. B, Chemical
ORCiD logo [1];  [2]; ORCiD logo [2];  [1]
  1. Univ. of Chicago, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
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Sensing nitrate concentrations in soil with high sensitivity and selectivity using field-deployable compact sensor platforms is a sought-after goal for environment and agriculture applications. This study demonstrates a new optically based nitrate sensing platform based on ion-selective membrane (ISM) functionalized chip-scale photonic micro-ring resonators. Our approach relies upon measurements of resonance shifts in the micro-resonators and leverages the excellent, though little studied, optical properties of ISMs. Using a high-quality micro-ring resonator, a nitrate ion-selective photonic sensor exhibits a detection limit down to 0.1 parts per million (ppm) and enables nitrate concentration measurements in the 1-100 ppm level, appropriate for soil science and agriculture. Importantly, the sensor also shows high selectivity over other competing anions in soil, such as Cl- and NO2-. Here, we argue that this chip-scale approach can be incorporated into compact sensor platforms.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1787578
Journal Information:
Sensors and Actuators. B, Chemical, Journal Name: Sensors and Actuators. B, Chemical Vol. 328; ISSN 0925-4005
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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47 OTHER INSTRUMENTATION
Integrated photonic sensor
Ion selective membrane
Micro-ring resonator
Nitrate sensor