2 research outputs found
Wearable Sweatband Sensor Platform Based on Gold Nanodendrite Array as Efficient Solid Contact of Ion-Selective Electrode
As chemical sensors
are in great demand for portable and wearable
analytical applications, it is highly desirable to develop an all-solid-state
ion-selective electrode (ISE) and reference electrode (RE) platform
with simplicity and stability. Here we propose a wearable sensor platform
with a new type of all-solid-state ISE based on a gold nanodendrite
(AuND) array electrode as the solid contact and a poly(vinyl acetate)/inorganic
salt (PVA/KCl) membrane-coated all-solid-state RE. A simple and controllable
method was developed to fabricate the AuNDs on a microwell array patterned
chip by one-step electrodeposition without additional processing.
For the first time, the AuND electrodes with different real surface
area and double layer capacitance were developed as solid contact
of the Na<sup>+</sup>-ISE to investigate the relationship between
performance of the ISE and surface area. As-prepared AuND-ISE with
larger surface area (∼7.23 cm<sup>2</sup>) exhibited enhanced
potential stability compared to those with smaller surface area (∼1.85
cm<sup>2</sup>) and to bare Au ISE. Important as the ISE, the PVA/KCl
membrane-coated Ag/AgCl RE exhibited highly stable potential even
after 3 months’ storage. Finally, a wearable sweatband sensor
platform was developed for efficient sweat collection and real-time
analysis of sweat sodium during indoor exercise. This all-solid-state
ISE and RE integrated sensor platform provided a very simple and reliable
way to construct diverse portable and wearable devices for healthcare,
sports, clinical diagnosis, and environmental analysis applications