Fast-response ionogel humidity sensor for real-time monitoring of breathing rate

2019 ◽  
Vol 3 (3) ◽  
pp. 484-491 ◽  
Author(s):  
Songhua Xiao ◽  
Jianxia Nie ◽  
Rou Tan ◽  
Xiaochuan Duan ◽  
Jianmin Ma ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Real Time ◽  
Humidity Sensor ◽  
Fast Response ◽  
Breathing Rate ◽  
Real Time Monitoring ◽  
Silica Network ◽  
Humidity Sensors ◽  
Human Breath

Ionogel-based chemoresistive humidity sensors have been successfully fabricated through ionothermal assembly of ionic liquids into a silica network, which exhibited superior humidity performances. Fast substantial impedance changes were observed with changing humidity for real-time monitoring of human breath.

scholarly journals Humidity sensor based on Gallium Nitride for real time monitoring applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chaudhry Muhammad Furqan ◽  
Muhammad Umair Khan ◽  
Muhammad Awais ◽  
Fulong Jiang ◽  
Jinho Bae ◽  
...  
Keyword(s):  
Gallium Nitride ◽  
Real Time ◽  
Humidity Sensor ◽  
Low Cost ◽  
Fast Response ◽  
Current Response ◽  
High Electron ◽  
Real Time Monitoring ◽  
Sensing Applications ◽  
Monitoring Applications

AbstractGallium Nitride (GaN) remarkably shows high electron mobility, wide energy band gap, biocompatibility, and chemical stability. Wurtzite structure makes topmost Gallium atoms electropositive, hence high ligand binding ability especially to anions, making it usable as humidity sensor due to water self-ionization phenomenon. In this work, thin-film GaN based humidity sensor is fabricated through pulse modulated DC magnetron sputtering. Interdigitated electrodes (IDEs) with 100 μm width and spacing were inkjet printed on top of GaN sensing layer to further enhance sensor sensitivity. Impedance, capacitance, and current response were recorded for humidity and bio-sensing applications. The sensor shows approximate linear impedance response between 0 and 100% humidity range, the sensitivity of 8.53 nF/RH% and 79 kΩ/RH% for capacitance and impedance, and fast response (Tres) and recovery (Trec) time of 3.5 s and 9 s, respectively. The sensor shows little hysteresis of < 3.53% with stable and wide variations for accurate measurements. Especially, it demonstrates temperature invariance for thermal stability. Experimental results demonstrate fabricated sensor effectively evaluates plant transpiration cycle through water level monitoring by direct attachment onto leaves without causing any damage as well as freshness level of meat loaf. These properties of the proposed sensor make it a suitable candidate for future electronics providing a low-cost platform for real time monitoring applications.

High-performance humidity sensors from Ni(SO4)0.3(OH)1.4 nanobelts

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6521-6525 ◽  
Author(s):  
Ming Zhuo ◽  
Yuejiao Chen ◽  
Tao Fu ◽  
Haonan Zhang ◽  
Zhi Xu ◽  
...  
Keyword(s):  
High Performance ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Humidity Sensors ◽  
Term Stability ◽  
Long Term Stability

Ni(SO4)0.3(OH)1.4 nanobelts are utilized in a humidity sensor by a facile method. The nanobelt based sensor shows a high sensitivity, fast response and long-term stability in the sensing process.

Calibrating an optical fiber humidity sensor and applying it in real-time monitoring of relative humidity in fresh concrete

2013 ◽  
Vol 11 (9) ◽  
pp. 090604-90606 ◽  
Author(s):  
Xiaokang Zhang Xiaokang Zhang ◽  
Zhuoyong Deng Zhuoyong Deng ◽  
Hanlang Xu Hanlang Xu
Keyword(s):  
Relative Humidity ◽  
Optical Fiber ◽  
Real Time ◽  
Humidity Sensor ◽  
Fresh Concrete ◽  
Real Time Monitoring

Highly chemoresistive humidity sensing using poly(ionic liquid)s

2016 ◽  
Vol 52 (54) ◽  
pp. 8417-8419 ◽  
Author(s):  
Lingling Wang ◽  
Xiaochuan Duan ◽  
Wuyuan Xie ◽  
Qiuhong Li ◽  
Taihong Wang
Keyword(s):  
Ionic Liquid ◽  
Relative Humidity ◽  
High Performance ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Humidity Sensors ◽  
Humidity Sensing ◽  
Good Repeatability ◽  
Poly Ionic Liquid

A novel resistance type humidity sensor was fabricated using poly(ionic liquid)s, which exhibited high sensitivity, fast response, small hysteresis and good repeatability at a relative humidity (RH) in the range of 11–98%, making poly(ionic liquid)s as promising sensing materials for high-performance humidity sensors.

Cu(OH)2 nanowires/graphene oxide composites based QCM humidity sensor with fast-response for real-time respiration monitoring

2020 ◽  
Vol 304 ◽  
pp. 127313 ◽  
Author(s):  
Han Fang ◽  
Jianbin Lin ◽  
Zhixiang Hu ◽  
Huan Liu ◽  
Zirong Tang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Real Time ◽  
Humidity Sensor ◽  
Fast Response ◽  
Respiration Monitoring ◽  
Oxide Composites

scholarly journals Real-Time Monitoring of 13C- and 18O-Isotopes of Human Breath CO2 Using a Mid-Infrared Hollow Waveguide Gas Sensor

2020 ◽  
Vol 92 (19) ◽  
pp. 12943-12949
Author(s):  
Tao Zhou ◽  
Tao Wu ◽  
Qiang Wu ◽  
Weidong Chen ◽  
Mingwei Wu ◽  
...  
Keyword(s):  
Real Time ◽  
Gas Sensor ◽  
Hollow Waveguide ◽  
Real Time Monitoring ◽  
Human Breath ◽  
Mid Infrared ◽  
Breath Co2

scholarly journals Low-Hysteresis and Fast Response Time Humidity Sensors Using Suspended Functionalized Carbon Nanotubes

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 680 ◽  
Author(s):  
Shivaram Arunachalam ◽  
Ricardo Izquierdo ◽  
Frederic Nabki
Keyword(s):  
Carbon Nanotubes ◽  
Response Time ◽  
Humidity Sensor ◽  
Fast Response ◽  
Hysteresis Curve ◽  
Humidity Sensors ◽  
Fold Reduction ◽  
Stable Performance ◽  
Suspended Structure ◽  
Temperature Surface

A humidity sensor using suspended carbon nanotubes (CNTs) was fabricated using a low-temperature surface micromachining process. The CNTs were functionalized with carboxylic acid groups that facilitated the interaction of water vapor with the CNTs. The humidity sensor showed a response time of 12 s and a recovery time of 47 s, along with superior hysteresis and stable performance. The hysteresis curve area of the suspended structure is 3.6, a 3.2-fold reduction in comparison to the non-suspended structure. A comparative study between suspended and non-suspended devices highlights the advantages of using a suspended architecture.

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