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...

Preparation of iron oxide (Fe2O3) nanoparticles thin film for humidity sensing device

2021 ◽  
Author(s):  
Korakot Onlaor ◽  
Ukit Boontanom ◽  
Thutiyaporn Thiwawong ◽  
Potiyan Songkeaw ◽  
Benchapol Tunhoo
Keyword(s):  
Thin Film ◽  
Iron Oxide ◽  
Fe2o3 Nanoparticles ◽  
Humidity Sensing

Humidity sensing and respiratory monitoring system constructed by quartz crystal microbalance sensors based on chitosan/polypyrrole composite film

2021 ◽  
Author(s):  
Xiaohua Liu ◽  
Dongzhi Zhang ◽  
Dongyue Wang ◽  
Tingting Li ◽  
Xiaoshuang Song ◽  
...  
Keyword(s):  
Composite Film ◽  
Monitoring System ◽  
Quartz Crystal Microbalance ◽  
Humidity Sensor ◽  
Quartz Crystal ◽  
Respiratory Monitoring ◽  
Humidity Sensing ◽  
Physical Modification ◽  
Modification Method ◽  
Polypyrrole Composite

In this work, a quartz crystal microbalance (QCM) humidity sensor based on chitosan/polypyrrole (CS/PPy) composite film was prepared by a facile physical modification method. The as-synthesized CS/PPy composite was characterized...

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.

scholarly journals Ultrafast Humidity Sensing by Anisotropic Deformation of Carbon Nitride Nanoribbons for Real-Time Respiratory Monitoring

2020 ◽  
Author(s):  
Yuye Zhang ◽  
Yongxiu Song ◽  
Hong Yang ◽  
Kaiyang Chen ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Real Time ◽  
Carbon Nitride ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Respiratory Monitoring ◽  
Humidity Sensing ◽  
User Friendly ◽  
Adsorption Desorption ◽  
Anisotropic Deformation

Developing humidity sensing materials with fast response and high sensitivity was of great interest for many applications from industrial field to human healthcare. Here, we report a carbon nitride nanoribbons (CNNRs)-based humidity sensor. Thanks to the delicate humidity-responsive anisotropic deformation and well-balanced hydrophilic surfaces/hydrophobic framework with rapid adsorption/desorption of water molecules by CNNRs, this humidity sensor possessed an ultrafast response of ca. 50 ms, high reproducibility and selectivity, and linearity in an almost full humidity range. As an example, this sensor was successfully applied to real-time breathing detection, and the as-obtained breathing graphic waveforms exhibited a higher sensitivity than that by the traditional clinic measurements. This work would pave a new way for ultrafast and sensitive humidity sensing by using anisotropic deformation of CNNRs and introduce a new application scheme of humidity sensors in more user-friendly respiratory monitoring with higher resolution.<br>

Humidity sensing properties of transferable polyaniline thin films formed at the air–water interface

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 96935-96941 ◽  
Author(s):  
Tong-Fei Wu ◽  
Jong-Dal Hong
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Water Interface ◽  
Humidity Sensing ◽  
Response Recovery ◽  
Air Water Interface ◽  
Recovery Times ◽  
Humidity Sensing Properties

A humidity sensor made from a transferable PANI thin film exhibits relatively high sensitivity and short response/recovery times. The sensitive properties are tailorable by acid doping.

scholarly journals Ultrafast Humidity Sensing by Anisotropic Deformation of Carbon Nitride Nanoribbons for Real-Time Respiratory Monitoring

2020 ◽  
Author(s):  
Yuye Zhang ◽  
Yongxiu Song ◽  
Hong Yang ◽  
Kaiyang Chen ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Real Time ◽  
Carbon Nitride ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Respiratory Monitoring ◽  
Humidity Sensing ◽  
User Friendly ◽  
Adsorption Desorption ◽  
Anisotropic Deformation

Developing humidity sensing materials with fast response and high sensitivity was of great interest for many applications from industrial field to human healthcare. Here, we report a carbon nitride nanoribbons (CNNRs)-based humidity sensor. Thanks to the delicate humidity-responsive anisotropic deformation and well-balanced hydrophilic surfaces/hydrophobic framework with rapid adsorption/desorption of water molecules by CNNRs, this humidity sensor possessed an ultrafast response of ca. 50 ms, high reproducibility and selectivity, and linearity in an almost full humidity range. As an example, this sensor was successfully applied to real-time breathing detection, and the as-obtained breathing graphic waveforms exhibited a higher sensitivity than that by the traditional clinic measurements. This work would pave a new way for ultrafast and sensitive humidity sensing by using anisotropic deformation of CNNRs and introduce a new application scheme of humidity sensors in more user-friendly respiratory monitoring with higher resolution.<br>

scholarly journals Wide range and highly linear signal processed systematic humidity sensor array using Methylene Blue and Graphene composite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Muhammad Umair Khan ◽  
Gul Hassan ◽  
Rayyan Ali Shaukat ◽  
Qazi Muhammad Saqib ◽  
Mahesh Y. Chougale ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Linear Combination ◽  
Linear Function ◽  
Humidity Sensor ◽  
Sensor Array ◽  
Combination Method ◽  
Humidity Sensing ◽  
Sensing Applications ◽  
Wide Range ◽  
Graphene Flakes

AbstractThis paper proposes a signal processed systematic 3 × 3 humidity sensor array with all range and highly linear humidity response based on different particles size composite inks and different interspaces of interdigital electrodes (IDEs). The fabricated sensors are patterned through a commercial inkjet printer and the composite of Methylene Blue and Graphene with three different particle sizes of bulk Graphene Flakes (BGF), Graphene Flakes (GF), and Graphene Quantum Dots (GQD), which are employed as an active layer using spin coating technique on three types of IDEs with different interspaces of 300, 200, and 100 µm. All range linear function (0–100% RH) is achieved by applying the linear combination method of nine sensors in the signal processing field, where weights for linear combination are required, which are estimated by the least square solution. The humidity sensing array shows a fast response time (Tres) of 0.2 s and recovery time (Trec) of 0.4 s. From the results, the proposed humidity sensor array opens a new gateway for a wide range of humidity sensing applications with a linear function.

Sign in / Sign up

Export Citation Format

Share Document