An ion-selective chemiresistive platform as demonstrated for the detection of nitrogen species in water

Abstract

Ion-selective chemiresistive sensor platform for continuous monitoring over a wide concentration range, with low LOD, good response time, selectivity, reproducibility, and reversibility. The economical, simple devices don't need reference electrodes.

A highly sensitive ion-selective chemiresistive sensor for online monitoring of lead ions in water

“…35 For comparison, a batch of sensors including a bare sensor (resistive film: SWCNTs) and three Pb 2+ sensors (SWCNTs coated with ISM) were fabricated with a previously reported method using copper tape after air-brushing the CNT film and with a circular opening for the ISM. 31 The bare air-brushed CNT films did not show a clear response to Pb 2+ ions, only a slight decrease in current was observed at higher concentrations whereas the response of the films covered with ISM was clearly notable at 33 μg L −1 Pb 2+ (Fig. S1†).…”

“…S1†). Although Pb 2+ detection using ISM-covered CNT-based chemiresistors is a feasible proposition in analogy to previous work with nitrogen species, 31 it does not yet fulfill the requirement of detecting less than 10 μg L −1 of analyte. A sensor with a resistive film of SWCNTs functionalized with NaOH·15-crown-5 ether solution 34 (f-SWCNTs) was able to detect as little as 10 μg L −1 Pb 2+ (Fig.…”

“…29,30 Recently, a new ion-selective chemiresistive platform was introduced by our group for detecting nitrate, nitrite and ammonium. 31 A top layer of ion-selective membrane (ISM) simultaneously protects the sensors surfaces and enhances their selectivity. 31 In order to be relevant for Pb 2+ detection, the sensitivity of the platform needs to be enhanced further.…”

“…31 A top layer of ion-selective membrane (ISM) simultaneously protects the sensors surfaces and enhances their selectivity. 31 In order to be relevant for Pb 2+ detection, the sensitivity of the platform needs to be enhanced further.…”

Continuous Monitoring of Monochloramine in Water, and Its Distinction from Free Chlorine and Dichloramine Using a Functionalized Graphene-Based Array of Chemiresistors

“…Furthermore, this method holds the potential to be expanded to other platforms such as ion-selective chemiresistive platforms for robust sensing of analytes. 41,52 ■ ASSOCIATED CONTENT * sı Supporting Information…”