Abstract
In this paper, we propose a novel bio-compatible organic humidity sensor based on natural inner egg shell membrane (IESM) with multilayer cross linked fiber structure that can be used as a substrate as well as a sensing active layer. To fabricate the proposed sensors, two different size inter digital electrodes (IDEs) with 10 mm × 4 mm for sensor 1 and 12 mm × 6 mm for sensor 2 are printed on the surface of the IESM through Fujifilm Dimatix DMP 3000 inkjet material printing setup, which have finger width of 100 μm and space of 100 μm. The fabricated sensors stably operates in a relative humidity (RH) range between 0% RH to 90% RH, and its output impedance and capacitance response are recorded at 1 kHz and 10 kHz. The response time (Tres) and recovery time (Trec) of sensor 1 are detected as ~1.99 sec and ~8.76 sec, respectively and the Tres and Trec of sensor 2 are recorded as ~2.32 sec and ~9.21 sec, respectively. As the IESM for the humidity sensor, the natural materials can be implemented in our daily life as they open a new gate way for bio-compatible devices.
Highlights
In environment sensing, there are various factors to be detected like humidity level[1], temperature[2], various gases (N2, CO2, O2, etc.)[3,4], and light intensity[5]
The fabricated sensor is tested with homemade humidity sensing setup, which has a impedance and capacitance response range from 0% relative humidity (RH) to 90% RH, and this bio-compatible humidity sensor achieves a response time (Tres) of ~1.99 sec and a recovery time (Trec) of ~8.76 sec using sensor 1 and Tres of ~2.32 sec and Trec of ~9.21 sec using sensor 2
The 2D and 3D nanoprofile of the inter digital electrodes (IDEs) is illustrate as shown in Fig. 2c,d, which insures that electrodes are properly fabricated with the inkjet printer
Summary
There are various factors to be detected like humidity level[1], temperature[2], various gases (N2, CO2, O2, etc.)[3,4], and light intensity[5]. For an eco-friendly, low cost and high performance devices, many researchers are exploring natural materials, for example, humidity sensing layer and substrate using onion membrane[21], piezoelectric nanogenerator using onion skin[22], silk fiber applied in electronic devices and non-volatile resistive memory[23,24], and fish scale based piezoelectric nanogenerator[25]. A biomaterial can be obtained from a hen egg and it is widely using as food in the world It can be applied in different applications like egg albumen as an active layer for non-volatile resistive memory[26], a high performance electrode for super capacitor using carbonized egg shell[27], a bio-sensor to determine the glucose using inner egg shell membrane (IESM)[28], and piezoelectric flexible nanogenerator using IESM29. To find the material characteristics of the IESM, its elemental composition is performed with energy dispersive X-ray (EDS) spectrometer
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