Design of high sensitivity graphite carbon nitride/zinc oxide humidity sensor for breath detection

2021 ◽  
Vol 332 ◽  
pp. 129536
Author(s):  
Shuguo Yu ◽  
Chu Chen ◽  
Hongyan Zhang ◽  
Jun Zhang ◽  
Jing Liu
Keyword(s):  
Zinc Oxide ◽  
Carbon Nitride ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Breath Detection

Synthesized of Highly Sensitive Tin (IV)-Doped Zinc Oxide Humidity Sensor

2015 ◽  
Vol 1109 ◽  
pp. 559-563
Author(s):  
Ahmad Syakirin Ismail ◽  
Mohd Firdaus Malek ◽  
Muhammad Amir Ridhwan Abdullah ◽  
Mohamad Hafiz Mamat ◽  
M. Rusop
Keyword(s):  
Zinc Oxide ◽  
Recovery Time ◽  
Humidity Sensor ◽  
Sol Gel ◽  
High Sensitivity ◽  
Average Diameter ◽  
Undoped Sample ◽  
Immersion Method ◽  
Response Recovery ◽  
Highly Sensitive

High sensitivity Tin (IV) (Sn) - doped zinc oxide (ZnO) humidity sensor was deposited using sol-gel immersion method. The Sn-doped sample was deposited on glass substrate and undoped sample was also prepared to seem the improvement made through doping process. The analyses showed that the sensor’s morphology has become more porous and having lower average diameter of nanorods, high conductivity and higher response, recovery time, and sensitivity. The sensitivity of the sensor increased from 2 to 4 by doping with Sn.

scholarly journals Gr/3D–ZnO Nanocomposites as Humidity Sensors with Enhanced Sensing Response

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1623
Author(s):  
Wang-De Lin ◽  
You-Chen Lin ◽  
Ren-Jang Wu ◽  
Murthy Chavali
Keyword(s):  
Raman Spectroscopy ◽  
Zinc Oxide ◽  
Humidity Sensor ◽  
Response Times ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Atmospheric Humidity ◽  
Humidity Sensors ◽  
Structure And Morphology ◽  
Recovery Times

This work introduces a novel humidity sensor based on a nanocomposite material comprising graphene decorated with three-dimensional flower-like structures of zinc oxide (Gr/3D–ZnO) fabricated via a hydrothermal method with various weight percentages of graphene. The surface structure and morphology of the Gr/3D–ZnO nanocomposite were analyzed using XRD, EDS, SEM, TEM, and Raman spectroscopy. The influence of humidity on the electrical properties of the nanocomposite was also investigated. Experiment results revealed that the nanocomposite with 70 wt% of graphene provided high sensitivity (S = 446) with rapid response times (120 s) and recovery times (160 s). These results demonstrate the excellent potential of the proposed Gr/3D–ZnO nanocomposite in monitoring atmospheric humidity. A discussion on the mechanism underlying the effects of humidity on the Gr/3D–ZnO nanocomposite is also provided.

scholarly journals The Electrical Characteristics of Aluminium Doped Zinc Oxide Thin Film for Humidity Sensor Applications

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
N. D. Md Sin ◽  
M. Fuad Kamel ◽  
Rosalena Irma Alip ◽  
Zulfakri Mohamad ◽  
M. Rusop
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Doping Concentration ◽  
Humidity Sensor ◽  
Ultra Violet ◽  
High Sensitivity ◽  
Oxide Thin Film ◽  
Zno Thin Film ◽  
Electrical Characteristics ◽  
Voltage Measurement

The electrical characteristics of aluminum (Al) doped zinc oxide (ZnO) thin film for high sensitivity humidity sensors are presented. The effects of Al doping concentration at at % on the Al doped ZnO thin film properties were investigated using current-voltage measurement. The optical and structural properties were characterized using photoluminescence (PL), scanning emission microscope (SEM), and X-ray diffraction (XRD). Parameter 0.6 at % Aluminum doped show high sensitivity and suitable for humidity sensor. PL show an emissions band with two peaks centered at about 380 nm (ultra-violet (UV)) and 600 nm (green) in a room temperature. The length of the nanorods increases as the doping concentration increases. XRD results show the intensity of the (002) peak decreased with the increasing of doping concentration.

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 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>

High Sensitivity pH Sensors based on Amorphous Indium-gallium-zinc Oxide Thin-film Transistors

2015 ◽  
Vol 135 (6) ◽  
pp. 192-198 ◽  
Author(s):  
Shinnosuke Iwamatsu ◽  
Yutaka Abe ◽  
Toru Yahagi ◽  
Seiya Kobayashi ◽  
Kazushige Takechi ◽  
...  
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Thin Film Transistors ◽  
High Sensitivity ◽  
Oxide Thin Film ◽  
Indium Gallium Zinc Oxide ◽  
Ph Sensors ◽  
Zinc Oxide Thin Film ◽  
Indium Gallium

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.

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