Self-Assembled Polymer Thin Films Towards Nanoarchitectonics for Respiration Monitoring

2020 ◽  
Vol 20 (5) ◽  
pp. 2893-2901
Author(s):  
Premkumar Jayaraman ◽  
Chinnasamy Sengottaiyan ◽  
Karthik Krishnan
Keyword(s):  
Thin Films ◽  
Morphological Analysis ◽  
Humidity Sensor ◽  
Polymer Thin Films ◽  
Respiration Monitoring ◽  
Response Recovery ◽  
Human Respiration ◽  
Highly Sensitive ◽  
Transport Path ◽  
Self Assembled

Manipulation of ionic transport in the self-assembled polymer thin films using nanoarchitectonics approach can open the door for the development of novel electronic devices with ultrafast operation and low-power consumption. Here, we demonstrate a highly sensitive and ultrafast responsive flexible humidity sensor for human respiration monitoring. Humidity sensing behavior of the polymerbased planar devices, in which a polyethylene oxide-phosphotungstic acid (PEO-PWA) thin film is placed between an opposing inert electrodes, have been investigated by optimizing the device configuration and PWA salt concentration in the PEO matrix. The ultrafast response (~50 ms) and recovery (~52 ms) of the humidity sensor enabled us to study the real-time human respiration monitoring. Using morphological analysis, it is proposed that the ultrafast response-recovery time for this sensor is ascribed to their self-assembled lamellar-like structures of the PEO-PWA matrix polymer, which provides long-range continuous proton transport path in the polymer interface.

A highly sensitive humidity sensor based on an aggregation-induced emission luminogen-appended hygroscopic polymer microresonator

2021 ◽  
Author(s):  
Airong Qiagedeer ◽  
Hiroshi Yamagishi ◽  
Minami Sakamoto ◽  
Hanako Hasebe ◽  
Fumitaka Ishiwari ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
High Sensitivity ◽  
Aggregation Induced Emission ◽  
Highly Sensitive ◽  
Self Assembled

A self-assembled microsphere resonator, comprising a hygroscopic polymer with aggregation-induced emission luminogen pendants, can sense humidity with high sensitivity and repeatability.

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.

Micropatterning of Conducting Polymer Thin Films on Reactive Self-assembled Monolayers

2003 ◽  
Vol 15 (14) ◽  
pp. 2699-2701 ◽  
Author(s):  
Ziqi Liang ◽  
Mindaugas Rackaitis ◽  
Kun Li ◽  
Evangelos Manias ◽  
Qing Wang
Keyword(s):  
Thin Films ◽  
Conducting Polymer ◽  
Polymer Thin Films ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

scholarly journals Performance of the highly sensitive humidity sensor constructed with nanofibrillated cellulose/graphene oxide/polydimethylsiloxane aerogel via freeze drying

RSC Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 1543-1552
Author(s):  
Yutong Yang ◽  
Guoting Su ◽  
Qilin Li ◽  
Zipiao Zhu ◽  
Shaoran Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Freeze Drying ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Nanofibrillated Cellulose ◽  
Rapid Response ◽  
Response Recovery ◽  
Highly Sensitive ◽  
Recovery Behavior

This work presents a nanocellulose-based humidity sensor with high sensitivity, remarkable reproducibility and rapid response/recovery behavior fabricated via freeze drying.

scholarly journals Preparation and Performance Analysis of Ag/ZnO Humidity Sensor

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 857
Author(s):  
Peng Li ◽  
Shuguo Yu ◽  
Hongyan Zhang
Keyword(s):  
Active Sites ◽  
Humidity Sensor ◽  
Molar Ratio ◽  
Water Molecules ◽  
Humidity Sensors ◽  
Response Recovery ◽  
Highly Sensitive ◽  
Stable Performance ◽  
And Performance ◽  
Decomposition Of Water

Highly sensitive silver (Ag) modified zinc oxide (ZnO) humidity sensors were prepared by hydrothermal synthesis and the mechanism was studied. Experimental results show that Ag-modified ZnO can effectively enhance the performance of a humidity sensor. Large number of oxygen vacancies and many active sites are generated on the surface when molar ratio of Ag+ to Zn2+ is 1:100, which can accelerate the decomposition of water molecules on surface of the material, thereby improving the response of humidity sensor. Moreover, the linearity of ZnO humidity sensor is greatly improved by silver nanoparticles. Compared with previously reported ZnO-based humidity sensors, Ag/ZnO humidity sensors have a better response (151,700%), good linearity, low hysteresis (3%), and short response/recovery time (36/6 s). At the same time, it is found that the light had little effect on the performance of Ag/ZnO. Therefore, this kind of ZnO sensor with stable performance and excellent performance is expected to be used in the detection of relative humidity in conventional environments.

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