scholarly journals Polyacrylonitrile/CoCl2 Nanofibers Based Humidity Sensor for Human Breath and Ambient Humidity Monitoring

2021 ◽  
Author(s):  
Xiaoqiang Li ◽  
Pang Zengyuan ◽  
Li Mengjuan ◽  
Jin Yang
Keyword(s):  
Humidity Sensor ◽  
Dual Function ◽  
Colorimetric Sensing ◽  
Promising Candidate ◽  
Human Breath ◽  
Ambient Humidity ◽  
Sem Image ◽  
Hybrid Nanofibers ◽  
Highly Sensitive ◽  
Humidity Monitoring

Abstract A novel humidity sensor was constructed using the hybrid nanofibers of polyacrylonitrile/CoCl2 (PAN/CoCl2), which were fabricated by electrospinning. Scanning electron microscopy (SEM) image demonstrated that the diameter of PAN/CoCl2 nanofibers ranged from 100 - 500 nm. Energy-dispersive X-ray spectrometer (EDS) analysis confirmed that Co and Cl elements were homogeneously dispersed on the PAN nanofibers. CoCl2 on the surface of PAN nanofibers play a dual function in humidity sensing performances. First, CoCl2 serves as an indicator, which can change the color of nanofibers from blue to white-pink as the relative humidity changed from 11 to 98 %, to realize the colorimetric sensing. Second, CoCl2 could remarkably improve the electric sensing performance. As a result, the PAN/CoCl2 nanofibers offered much enhanced response currents compared to the pristine PAN nanofibers, as the humidity changed from RH 11 to 98 %. In addition, the PAN/CoCl2 nanofibers based humidity sensor was employed to monitor human breath and the ambient humidity, which demonstrated the excellent sensitivity of this humidity sensor. Therefore, we believe that the highly sensitive and simply designed PAN/CoCl2 humidity sensor is a promising candidate for various applications in the field of humidity monitoring.

scholarly journals Highly Sensitive Surface Plasmon Resonance Humidity Sensor Based on a Polyvinyl-Alcohol-Coated Polymer Optical Fiber

Biosensors ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 461
Author(s):  
Ying Wang ◽  
Jingru Wang ◽  
Yu Shao ◽  
Changrui Liao ◽  
Yiping Wang
Keyword(s):  
Surface Plasmon Resonance ◽  
Polyvinyl Alcohol ◽  
Optical Fiber ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Humidity Sensor ◽  
Wavelength Shift ◽  
Polymer Optical Fiber ◽  
Human Breath ◽  
Highly Sensitive

A surface-plasmon-resonance-based fiber device is proposed for highly sensitive relative humidity (RH) sensing and human breath monitoring. The device is fabricated by using a polyvinyl alcohol (PVA) film and gold coating on the flat surface of a side-polished polymer optical fiber. The thickness and refractive index of the PVA coating are sensitive to environmental humidity, and thus the resonant wavelength of the proposed device exhibits a redshift as the RH increases. Experimental results demonstrate an average sensitivity of 4.98 nm/RH% across an ambient RH ranging from 40% to 90%. In particular, the sensor exhibits a linear response between 75% and 90% RH, with a sensitivity of 10.15 nm/RH%. The device is suitable for human breath tests and shows an average wavelength shift of up to 228.20 nm, which is 10 times larger than that of a silica-fiber-based humidity sensor. The corresponding response and recovery times are determined to be 0.44 s and 0.86 s, respectively. The proposed sensor has significant potential for a variety of practical applications, such as intensive care and human health analysis.

scholarly journals A highly sensitive biosensor based on methacrylated graphene oxide-grafted polyaniline for ascorbic acid determination

2020 ◽  
Vol 9 (1) ◽  
pp. 760-767 ◽  
Author(s):  
Seyed Morteza Naghib ◽  
Farahnaz Behzad ◽  
Mehdi Rahmanian ◽  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Current Response ◽  
Functionalized Graphene ◽  
Serum Samples ◽  
Promising Candidate ◽  
Graphene Nanocomposites ◽  
Selective Determination ◽  
Highly Sensitive

AbstractFunctionalized graphene-based nanocomposites have opened new windows to address some challenges for increasing the sensitivity, accuracy and functionality of biosensors. Polyaniline (PANI) is one of the most potentially promising and technologically important conducting polymers, which brings together the electrical features of metals with intriguing properties of plastics including facile processing and controllable chemical and physical properties. PANI/graphene nanocomposites have attracted intense interest in various fields due to unique physicochemical properties including high conductivity, facile preparation and intriguing redox behavior. In this article, a functionalized graphene-grafted nanostructured PANI nanocomposite was applied for determining the ascorbic acid (AA) level. A significant current response was observed after treating the electrode surface with methacrylated graphene oxide (MeGO)/PANI nanocomposite. The amperometric responses showed a robust linear range of 8–5,000 µM and detection limit of 2 µM (N = 5). Excellent sensor selectivity was demonstrated in the presence of electroactive components interfering species, commonly found in real serum samples. This sensor is a promising candidate for rapid and selective determination of AA.

Highly sensitive BEHP-co-MEH:PPV + Poly(acrylic acid) partial sodium salt based relative humidity sensor

2017 ◽  
Vol 246 ◽  
pp. 809-818 ◽  
Author(s):  
Memoon Sajid ◽  
Hyun Bum Kim ◽  
Young Jin Yang ◽  
Jeongdai Jo ◽  
Kyung Hyun Choi
Keyword(s):  
Relative Humidity ◽  
Acrylic Acid ◽  
Sodium Salt ◽  
Humidity Sensor ◽  
Highly Sensitive ◽  
Relative Humidity Sensor ◽  
Poly Acrylic Acid

A highly sensitive room temperature humidity sensor based on 2D-WS2 nanosheets

FlatChem ◽  
2018 ◽  
Vol 9 ◽  
pp. 21-26 ◽  
Author(s):  
S.G. Leonardi ◽  
W. Wlodarski ◽  
Y. Li ◽  
N. Donato ◽  
Z. Sofer ◽  
...  
Keyword(s):  
Room Temperature ◽  
Humidity Sensor ◽  
Highly Sensitive ◽  
Ws2 Nanosheets

Cellulose-g-tetraethylenepentamine Dual-function Imprinted Polymers Selectively and Effectively Adsorb and Remove 4-Nitrophenol and Cr(VI)

2021 ◽  
Author(s):  
Daning Lang ◽  
Xia Xu ◽  
Ronglan Wu ◽  
WEI WANG ◽  
Ming Shi ◽  
...  
Keyword(s):  
Binary Systems ◽  
Competitive Adsorption ◽  
Dual Function ◽  
Imprint Polymer ◽  
Inorganic Contaminants ◽  
Cellulosic Material ◽  
Imprinted Polymer ◽  
Promising Candidate ◽  
Adsorption Sites ◽  
Amine Groups

Abstract A cellulosic material could efficiently and selectively adsorb organic and inorganic contaminants from aqueous solutions without interference from competing adsorption sites. In this study, cellulose-graft-tetraethylenepentamin molecular imprinted polymer (C-TEPA-MIP) was synthesized by using 4-nitrophenol (4-NP) as the template. The C-TEPA-MIP adsorbent could adsorb 4-NP and Cr(VI) simultaneously and selectively, without being affected by the competitive adsorption sites of each of these pollutants. The adsorption of 4-NP was predominantly due to the imprinted sites of 4-NP in C-TEPA-MIP that were located inside of the adsorbent, whereas that of Cr(VI) was primarily due to the amine groups of TEPA found on the surface of the adsorbent. Compared with the non-imprint polymer synthesized without the template, C-TEPA-MIP showed higher selectivity for both 4-NP and Cr(VI) in unitary and binary systems. In addition, C-TEPA-MIP exhibited good stability and recyclability for 4-NP, which makes it a promising candidate material for applications concerning wastewater treatment.

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.

3D printed castle style Fabry-Perot microcavity on optical fiber tip as a highly sensitive humidity sensor

2021 ◽  
Vol 328 ◽  
pp. 128981
Author(s):  
Mao-qing Chen ◽  
Yong Zhao ◽  
He-ming Wei ◽  
Cheng-liang Zhu ◽  
Sridhar Krishnaswamy
Keyword(s):  
Optical Fiber ◽  
Humidity Sensor ◽  
Highly Sensitive ◽  
Fabry Perot ◽  
3D Printed
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