scholarly journals Design and Fabrication of a Fast Response Resistive-Type Humidity Sensor Using Polypyrrole (Ppy) Polymer Thin Film Structures

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3019
Author(s):  
Mushahid Hussain ◽  
Saqib Hasnain ◽  
Nadir Ali Khan ◽  
Shehar Bano ◽  
Fazeelat Zuhra ◽  
...  
Keyword(s):  
Thin Film ◽  
Composite Material ◽  
Humidity Sensor ◽  
Experimental Result ◽  
Organic Polymer ◽  
Interdigitated Electrodes ◽  
Humidity Response ◽  
Response And Recovery ◽  
Resistive Type ◽  
Polypyrrole Composite

In this research article, an organic polymer based polypyrrole (Ppy) composite material has been synthesized and analyzed for the design and fabrication purposes of a fast-responsive, highly sensitive, and an economical resistive-type novel humidity detection sensor. This humidity sensor most suitably serves the purpose for industrial humidity (i.e., values ranging from low to high) detection applications. First, a polypyrrole composite material (a mixture of polypyrrole, polypyrrole-NiO, polypyrrole-CeO2, and polypyrrole-Nb2O5) has been synthesized by chemical oxidative polymerization method, and then is treated at various temperatures, i.e., 100, 150 and 200 °C, respectively. After this treatment, the synthesized samples were then characterized by using FTIR, SEM, and DTA/TGA techniques for analyzing humidity sensing properties. The polypyrrole samples with the best morphological structure and properties were then incorporated on interdigitated electrodes. For the fabrication purposes of this thin film structure, at first a few drops of polyvinyl alcohol (PVA) were placed over interdigitated electrodes (IDE) and then the synthesized polypyrrole composite was uniformly deposited in the form of a thin film over it. The plots show that this is a good resistive-type humidity detection device for the relative humidity range of 30% to 90%. The response and recovery times of this newly fabricated humidity sensor were reported to be the same as 128 s at room temperature. Additionally, the stability and the repeatability response behavior of this Ppy sensor were verified up to five cycles of multiple repetitions. This presents an excellent stability and repeatability performance of the sensor. Furthermore, the capacitances versus humidity response and recovery properties of the designed sensor were studied too. This illustrates an excellent capacitive verses humidity response and shows a linear and an active behavior. Lastly, the experimental result proves that polypyrrole composite thin film shows a reasonable best performance up to a temperature of 100 °C.

A micromachined resistive-type humidity sensor with a composite material as sensitive film

2006 ◽  
Vol 113 (2) ◽  
pp. 837-842 ◽  
Author(s):  
Pi-Guey Su ◽  
Chao-Jen Ho ◽  
Yi-Lu Sun ◽  
I-Cherng Chen
Keyword(s):  
Composite Material ◽  
Humidity Sensor ◽  
Sensitive Film ◽  
Resistive Type

Ultra-smooth TiO2 thin film based optical humidity sensor with a fast response and recovery

2019 ◽  
Vol 58 (36) ◽  
pp. 9740
Author(s):  
Xiaoqing Wang ◽  
Min Lai ◽  
Ruijie Gao ◽  
Xixi Huang ◽  
Ziming Zhao ◽  
...  
Keyword(s):  
Thin Film ◽  
Humidity Sensor ◽  
Tio2 Thin Film ◽  
Fast Response ◽  
Response And Recovery

scholarly journals HUMIDITY SENSOR USING CuO NANORICES THIN FILM

Anales AFA ◽  
2021 ◽  
Vol 32 (3) ◽  
pp. 76-82
Author(s):  
P.M. Perillo ◽  
◽  
D.F. Rodríguez ◽  
Keyword(s):  
Thin Film ◽  
Humidity Sensor ◽  
Low Cost ◽  
Complex Impedance ◽  
X Ray Diffraction ◽  
Silar Method ◽  
Practical Applications ◽  
Layer Adsorption ◽  
Response And Recovery ◽  
New Generation

In this paper, a humidity sensor based on CuO has been successfully fabricated. Thin-film of CuO nanorices were synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method on silicon wafer with Si3N4thinlayer as a substrate. The microstructure and morphology of the samples were investigated using X-ray diffraction(XRD) and scanning electron microscopy (SEM). Humidity sensing properties of the thin films have been studied. The sensing response has been measured in the relative humidity (RH) range from 20 up to 80 % at room temperature. It was found that impedance of the system decreases as the RH was increased. The prepared sensor revealed good reversibility with response and recovery time of 130 s and 320 s respectively. The complex impedance spectra were analyzed in the range of 0.1 to 1 kHz. This type of humidity sensor can be used as a new generation of ecological sensors with low cost and good stability. It makes the sensor a candidate for practical applications.

scholarly journals Preparation and Research of a High-Performance ZnO/SnO2 Humidity Sensor

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 293
Author(s):  
Fan Li ◽  
Peng Li ◽  
Hongyan Zhang
Keyword(s):  
Composite Material ◽  
High Performance ◽  
Humidity Sensor ◽  
Tin Dioxide ◽  
Complex Impedance ◽  
Material Surface ◽  
Pure Sno2 ◽  
Long Term Stability ◽  
Response And Recovery ◽  
Complex Impedance Spectra

A high-performance zinc oxide/tin dioxide (ZnO/SnO2) humidity sensor was developed using a simple solvothermal method. The sensing mechanism of the ZnO/SnO2 humidity sensor was evaluated by analyzing its complex impedance spectra. The experimental results prove that the ZnO/SnO2 composite material has a larger specific surface area than pure SnO2, which allows the composite material surface to adsorb more water to enhance the response of the ZnO/SnO2 humidity sensor. ZnO can also contribute to the generation of oxygen-rich vacancies on the ZnO/SnO2 composite material surface, allowing it to adsorb a large amount of water and rapidly decompose water molecules into conductive ions to increase the response and recovery speed of the ZnO/SnO2 humidity sensor. These characteristics allowed the Z/S-2 humidity sensor to achieve a higher response (1,225,361%), better linearity, smaller hysteresis (6.6%), faster response and recovery speeds (35 and 8 s, respectively), and long-term stability at 11–95% relative humidity. The successful preparation of the ZnO/SnO2 composite material also provides a new direction for the design of SnO2-based resistance sensors with high humidity-sensing performance.

scholarly journals Highly Efficient and Wide Range Humidity Response of Biocompatible Egg White Thin Film

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1815
Author(s):  
Hafiz Mohammad Mutee Ur Rehman ◽  
Muhammad Muqeet Rehman ◽  
Muhammad Saqib ◽  
Shenawar Ali Khan ◽  
Maryam Khan ◽  
...  
Keyword(s):  
Thin Film ◽  
Humidity Sensor ◽  
Low Cost ◽  
High Sensitivity ◽  
Egg White ◽  
Functional Layer ◽  
Detection Range ◽  
Humidity Response ◽  
Wide Range ◽  
Device Size

Biopolymers are a solution to solve the increasing problems caused by the advances and revolution in the electronic industry owing to the use of hazardous chemicals. In this work, we have used egg white (EW) as the low-cost functional layer of a biocompatible humidity sensor and deposited it on gold (Au) interdigitated electrodes (IDEs) patterned through the state-of-the-art fabrication technology of thermal vacuum evaporation. The presence of hydrophilic proteins inside the thin film of EW makes it an attractive candidate for sensing humidity. Usually, the dependence of the percentage of relative humidity (%RH) on the reliability of measurement setup is overlooked for impedimetric humidity sensors but we have used a modified experimental setup to enhance the uniformity of the obtained results. The characteristics of our device include almost linear response with a quick response time (1.2 s) and fast recovery time (1.7 s). High sensitivity of 50 kΩ/%RH was achieved in the desirable detection range of 10–85%RH. The device size was intentionally kept small for its potential integration in a marketable chip. Results for the response of our fabricated sensor for dry and wet fingertips, along with determining the rate of breathing through the mouth, are part of this study, making it a potential device for health monitoring.

Ultrafast resistive type γ-Fe2O3-rGO nanohybrids based humidity sensor – a respiratory monitoring tool

2021 ◽  
Author(s):  
Atul Kumar ◽  
Anil Kumar ◽  
Ghanshyam Das Varma
Keyword(s):  
Thin Film ◽  
Iron Oxide ◽  
Humidity Sensor ◽  
Respiratory Monitoring ◽  
Tempered Glass ◽  
Monitoring Tool ◽  
Humidity Sensing ◽  
Resistive Type ◽  
Excellent Tool

The resistive type sensing device has been fabricated by integrating a thin film of iron oxide-rGO nanohybrids on a flexible tempered glass, providing an excellent tool for humidity sensing for...

Rapid response and recovery humidity sensor based on CoTiO3 thin film prepared by RF magnetron co-sputtering with post annealing process

2015 ◽  
Vol 41 (10) ◽  
pp. 15176-15184 ◽  
Author(s):  
Jing Lu ◽  
Yabin Zhang ◽  
Zhuan Li ◽  
Jianfeng Huang ◽  
Yong Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Humidity Sensor ◽  
Annealing Process ◽  
Rapid Response ◽  
Post Annealing ◽  
Response And Recovery

Effect of Illumination on Organic Polymer Thin-Film Transistors

2003 ◽  
Vol 771 ◽  
Author(s):  
Michael C. Hamilton ◽  
Sandrine Martin ◽  
Jerzy Kanicki
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Drain Current ◽  
Charge Carriers ◽  
Electrical Performance ◽  
Organic Polymer ◽  
Light Illumination ◽  
Polymer Thin Film ◽  
Channel Region ◽  
White Light Illumination

AbstractWe have investigated the effects of white-light illumination on the electrical performance of organic polymer thin-film transistors (OP-TFTs). The OFF-state drain current is significantly increased, while the drain current in the strong accumulation regime is relatively unaffected. At the same time, the threshold voltage is decreased and the subthreshold slope is increased, while the field-effect mobility of the charge carriers is not affected. The observed effects are explained in terms of the photogeneration of free charge carriers in the channel region due to the absorbed photons.

scholarly journals Tin Disulfide-Coated Microfiber for Humidity Sensing with Fast Response and High Sensitivity

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 648
Author(s):  
Aijie Liang ◽  
Jingyuan Ming ◽  
Wenguo Zhu ◽  
Heyuan Guan ◽  
Xinyang Han ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
Small Diameter ◽  
High Sensitivity ◽  
Large Change ◽  
Small Variation ◽  
Response Speed ◽  
Fast Response ◽  
Tin Disulfide ◽  
Recovery Times ◽  
Response And Recovery

Breath monitoring is significant in assessing human body conditions, such as cardiac and pulmonary symptoms. Optical fiber-based sensors have attracted much attention since they are immune to electromagnetic radiation, thus are safe for patients. Here, a microfiber (MF) humidity sensor is fabricated by coating tin disulfide (SnS2) nanosheets onto the surface of MF. The small diameter (~8 μm) and the long length (~5 mm) of the MF promise strong interaction between guiding light and SnS2. Thus, a small variation in the relative humidity (RH) will lead to a large change in optical transmitted power. A high RH sensitivity of 0.57 dB/%RH is therefore achieved. The response and recovery times are estimated to be 0.08 and 0.28 s, respectively. The high sensitivity and fast response speed enable our SnS2-MF sensor to monitor human breath in real time.

scholarly journals A Full-Range Flexible and Printed Humidity Sensor Based on a Solution-Processed P(VDF-TrFE)/Graphene-Flower Composite

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1915
Author(s):  
Shenawar Ali Khan ◽  
Muhammad Saqib ◽  
Muhammad Muqeet Rehman ◽  
Hafiz Mohammad Mutee Ur Rehman ◽  
Sheik Abdur Rahman ◽  
...  
Keyword(s):  
Active Layer ◽  
Humidity Sensor ◽  
High Reliability ◽  
Full Range ◽  
High Sensitivity ◽  
Fast Response ◽  
Considerable Change ◽  
Relative Humidity Range ◽  
Response And Recovery ◽  
Proportional Relationship

A novel composite based on a polymer (P(VDF-TrFE)) and a two-dimensional material (graphene flower) was proposed as the active layer of an interdigitated electrode (IDEs) based humidity sensor. Silver (Ag) IDEs were screen printed on a flexible polyethylene terephthalate (PET) substrate followed by spin coating the active layer of P(VDF-TrFE)/graphene flower on its surface. It was observed that this sensor responds to a wide relative humidity range (RH%) of 8–98% with a fast response and recovery time of 0.8 s and 2.5 s for the capacitance, respectively. The fabricated sensor displayed an inversely proportional response between capacitance and RH%, while a directly proportional relationship was observed between its impedance and RH%. P(VDF-TrFE)/graphene flower-based flexible humidity sensor exhibited high sensitivity with an average change of capacitance as 0.0558 pF/RH%. Stability of obtained results was monitored for two weeks without any considerable change in the original values, signifying its high reliability. Various chemical, morphological, and electrical characterizations were performed to comprehensively study the humidity-sensing behavior of this advanced composite. The fabricated sensor was successfully used for the applications of health monitoring and measuring the water content in the environment.

Sign in / Sign up

Export Citation Format

Share Document