Flexible Electronic Sensors for Monitoring Human Motion & Physiological Signals

Chepuri, Madhava and Badhulika, Sushmee (2018) Flexible Electronic Sensors for Monitoring Human Motion & Physiological Signals. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

A research that is rapidly evolving for future electronics is to integrate the property of flexibility and stretchablity to develop human friendly devices. There have been number of reports on fabricating sensors and electronic devices on stretchable, bendable and soft materials like polyimide, polyurethane sponge, natu ral rubber, cellulose paper, tissue paper etc. using various nanomaterials such as 2D materials, metal oxides, carbon n anomaterials and metal nanofibers . These nanomaterials possess excellent electronic, thermal, mechanical and optical properties making th em suitable for fabrica tion temperature, pressure and strain sensors which find applications in the field of sensors, medical analysis , security and surveillance. In the second chapter, we demonstrate the fabrication of a capacitor with few layer MoS 2 gro wn on Al foil via solution processed hydrothermal method as electrodes and cellulose paper as a dielectric material and was investigated in human integrated passive electronic devices such as oscillators. There are no reports of MoS 2 on flexible substrate being utilized as capacitor electrode and further applied as frequency modulator via external strain modulation and human interaction. The study demonstrates the significance of few layered MoS2 over monolayer MoS2 for strain modulated assisted capacitance variation. Such a simple technique for fabrication of flexible variable capacitor is a major step ahead in flexible and wearable electronics having potential applications in analog, digital electronics and sensors. In the third chapter, demonstration of t he direct growth of ternary compound ZnSnO 3 on silica cloth for the fabrication of scalable tactile sensors for monitoring physiological signals which even the highly sensitive tactile sensors fail to measure and artificial electronic skin (E - skin) without the use of sophisticated silicon wafer based technologies. large area sensors array (4 x 4) were fabricated and integrated onto human hand which can “feel” the touch and spatially map the response paving way for the development of E - skin. The fabricated p ressure sensor was tested for its reliability by performing bending test studies under harsh deformations and 500 bending cycles which resulted in negligible change in the performance of the sensor . Human friendly large area arrays of pressure and strain s ensors is a major step ahead in the field of textile based wearable electronics having potential applications in the field of human machine interaction, consumer electronics, human motion monitoring and security etc

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