A new type low-cost, flexible and wearable tertiary nanocomposite sensor for room temperature hydrogen gas sensing

Abstract

This paper reports on reduced graphene oxide (rGO), tin oxide (SnO 2 ) and polyvinylidene fluoride (PVDF) tertiary nanocomposite thick film based flexible gas sensor. The nanocomposite of 0.90(PVDF) − 0.10[x(SnO 2 ) − (1 − x)rGO] with different weight percentages (x = 0, 0.15, 0.30, 0.45, 0.6, 0.75, 0.90 and 1) have been prepared by the hot press method. Chromium (Cr) has been deposited on the surface by using E-beam evaporation system, which is used as electrode of the device. Crystal structure, morphology, and electrical characteristics of the device have been explored for the technological application. A correlation between crystallinity, morphology, and electrical properties with these thick films has also been established. The device has been tested at different hydrogen (H 2 ) gas concentration as well as at different response times. A superior response of 0.90(PVDF) − 0.10[0.75(SnO 2 ) − 0.25 rGO] nanocomposite thick film has been observed. Hence, this composition is considered as optimized tertiary nanocomposite for the hydrogen gas sensor application. The sensor response of 49.2 and 71.4% with response time 34 sec and 52 sec for 100 PPM and 1000 PPM H 2 gas concentration respectively have been obtained. First time a new kind of low cost and flexible polymer based nanocomposite thick film gas sensor has been explored.

Wearable Sensors for Vital Signs Measurement: A Survey

“…The results suggested that the sensor response was 49.2% and 71.4% sec, respectively, and the sec of 100 ppm and 1000 ppm hydrogen concentration were obtained, respectively. A novel low-cost flexible polymer-based nano wearable sensor was explored for the first time [67]. Cheng et al (2021) synthesized a layered flower-like nickel-doped polymer using a onestep coprecipitation method and prepared a gas sensor, based on the prepared material, to evaluate its gas-sensing performance.…”

VOCs Sensing by Metal Oxides, Conductive Polymers, and Carbon-Based Materials

“…Most studies of gas/vapor sensitive materials are focused on the detection of low concentrations of CO, NO 2 , O 3 , H 2 , NH 3 , or H 2 S due to their toxicity, their relation with atmospheric composition, or the fact that these gases can be found at high levels in certain environments [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. However, in recent years, the application of gas/vapor sensitive materials has been extended to the detection of volatile organic compounds (VOCs), not only because their presence is significant in the industry and domestic sector, but also because of their relevance as markers for (indoor/outdoor) air [ 19 ] and food quality [ 20 ], and early diagnosis of several diseases [ 21 ].…”

Highly Sensitive, Flexible H2 Gas Sensors Based on Less Platinum Bimetallic Ni–Pt Nanocatalyst-Functionalized Carbon Nanofibers

“…Flexible and wearable technologies have made significant advances in recent years in terms of constructing bendable or foldable device architectures without altering their functionality by adopting economically viable fabrication methods. , Sensors are predicted as essential elements in portable and foldable devices used for consumer electronics, robotics, homeland security, health care, and environmental monitoring applications. Many types of flexible strain, pressure, temperature, gas, humidity, magnetic, chemical, electrochemical, light, and electropotential sensors have been developed for various wearable and flexible electronic applications. − In the gas sensing sector, classical MOS-based sensors, , which require high operating temperatures, are currently being replaced by low-power sensors based on graphene, carbon nanotubes, and 2D organic/inorganic materials , for the detection of various gases that can be easily integrated with flexible/wearable devices. , Alternate approaches to MOS-based gas sensors are metal doping or functionalization on MOS, e.g., Pd, Pt, Ag, Au, Ni, Ru, etc., , to selectively detect analyte gases.…”

“…Flexible and wearable technologies have made significant advances in recent years in terms of constructing bendable or foldable device architectures without altering their functionality by adopting economically viable fabrication methods. 1,2 Sensors are predicted as essential elements in portable and foldable devices used for consumer electronics, robotics, homeland security, health care, and environmental monitoring applications. Many types of flexible strain, pressure, temperature, gas, humidity, magnetic, chemical, electrochemical, light, and electropotential sensors have been developed for various wearable and flexible electronic applications.…”