Herein, we report an interdigitated capacitive sensor fabricated by mask-free laser lithography. The device is fabricated by laser printing of reverse features with toner followed by metal deposition and lift-off of toner in acetone. The fabricated device was utilized to measure ion concentration in water as well as a touch sensor. The ion sensor is able to measure the total ion concentration of water as well as distinguish the water from different sources. The touch sensor exhibited a significant difference between the capacitance values, with and without touch. This is a rapid, scalable and inexpensive approach for the fabrication of capacitive sensors and it involves neither harmful chemicals nor expensive and time-consuming fabrication steps. © 2019 IOP Publishing Ltd.

Shiv Govind Singh

Department of Electrical Engineering

S. Kanaparthi

S. Kayal

Indian Institute of Technology Hyderabad (IITH) is a premier institute of science and technology established in 2008. IITH has been consistently ranked in the&nbsp;<a href="https://iith.ac.in/reports/" rel="noopener noreferrer">top 10 institutes</a>&nbsp;in India for Engineering&nbsp;<a href="https://www.nirfindia.org/2021/EngineeringRanking.html" rel="noopener noreferrer" target="_blank">according to NIRF</a>&nbsp;making it one of the most coveted schools for science and technology in the country.

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Journal	Flexible and Printed Electronics
Publisher	Institute of Physics Publishing
ISSN	20588585