A portable wireless‐sensor system from all‐in‐one sensor array based hybrid solid contact layer for point‐of‐care ion monitoring in river basin

Abstract

The sensor arrays are considered as a promising way to aim at point-of-care (POC) testing for the detection of different ions in environment through the use of solid-contact ion-selective electrodes (SC-ISEs). However, the exorbitant equipment and intricate process for the production of SC-ISEs arrays has limit its application. Herein, the Au with nano-branched structure (Au NBS) and poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT : PSS) were decorated on the surface of bare pad of traditional printed circuit boards coated with Au (Au-PCB) to construct a hybrid solid-contact layer including double-layer capacitance and pseudocapacitance of SC-ISEs synergistically, thus the multichannel SC-ISEs exhibited high stability and specificity. Overall, based on portable multichannel sensor and homemade APP (Ion Analysis), a wireless all-in-one sensor system was constructed to detect ions with the limit of NO 3 À , Cl À , Na + , K + , Ca 2 + and Mg 2 + as 0.047 mM, 0.039 mM, 0.022 mM, 0.066 mM, 0.045 mM and 0.024 mM, respectively. Besides, it can detect such ions in river basin successfully. With the cost of each electrode less than 0.5 $, this sensor arrays enable a wide range of hazardous ion monitoring in water environment. K E Y W O R D Sall-in-one electrode, ions, point-of-care testing, river basin, solid contact layer

Self-Powered Potentiometric Sensor Based on a Passive Signal Amplifier with Electronic Paper Display

“…A capacitor exhibits a sufficiently high-power density and can realize rapid charging and discharging cycles. , In an important example, the charging of the capacitor upon sample composition change was used to dramatically increase the sensitivity of the potentiometric sensor using a method called constant potential capacitive readout . An amplifier is always used with ISEs to amplify the signal, but this is not possible in a self-powered sensing system . Introducing a capacitor as a highly efficient energy storage device to self-powered electrochemical biosensors is another direct and effective method to improve sensitivity.…”

“…12 An amplifier is always used with ISEs to amplify the signal, but this is not possible in a self-powered sensing system. 13 Introducing a capacitor as a highly efficient energy storage device to self-powered electrochemical biosensors is another direct and effective method to improve sensitivity. As an example, Zhang introduced a capacitor into a self-powered photoelectrochemical aptasensor that was 8.7 times more sensitive than a pure self-powered PEC aptasensor.…”