Enhancing room temperature ethanol sensing using electrospun Ag-doped SnO2–ZnO nanofibers

Lalwani, Suraj Kumar; Beniwal, Ajay; Kumar, Suraj

doi:10.1007/s10854-020-04276-9

Cited by 10 publications

(4 citation statements)

References 48 publications

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“…Further, the error bar for the three replicas along with the original sensor is represented in Figure 5 d. The margin of error with a confidence level of 99% is also calculated and found to be ±1.98%. In addition, the aging effect (i.e., stability of sensor with time 52 ) on the sensing performance was also evaluated by monitoring and comparing its performance at Week 1 and Week 21 in Figure S4 . The result depicts a highly stable response of the sensors having only a small drop (∼0.91%/%RH) in sensing performance.…”

Section: Results and Discussionmentioning

confidence: 99%

Eco-Friendly Textile-Based Wearable Humidity Sensor with Multinode Wireless Connectivity for Healthcare Applications

Beniwal,

Khandelwal,

Mukherjee

et al. 2024

ACS Appl. Bio Mater.

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Textile-based wearable humidity sensors are of great interest for human healthcare monitoring as they can provide critical human-physiology information. The demand for wearable and sustainable sensing technology has significantly promoted the development of eco-friendly sensing solutions for potential realworld applications. Herein, a biodegradable cotton (textile)-based wearable humidity sensor has been developed using fabsil-treated c o t t o n f a b r i c c o a t e d w i t h a p o l y ( 3 , 4ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) sensing layer. The structural, chemical composition, hygroscopicity, and morphological properties are examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), contact angle measurement, and scanning electron microscopy (SEM) analysis. The developed sensor exhibited a nearly linear response (Adj. R-square value observed as 0.95035) over a broad relative humidity (RH) range from 25 to 91.5%RH displaying high sensitivity (26.1%/%RH). The sensor shows excellent reproducibility (on replica sensors with a margin of error ±1.98%) and appreciable stability/aging with time (>4.5 months), high flexibility (studied at bending angles 30°, 70°, 120°, and 150°), substantial response/recovery durations (suitable for multiple applications), and highly repeatable (multicyclic analysis) sensing performance. The prospective relevance of the developed humidity sensor toward healthcare applications is demonstrated via breathing rate monitoring (via a sensor attached to a face mask), distinguishing different breathing patterns (normal, deep, and fast), skin moisture monitoring, and neonatal care (diaper wetting). The multinode wireless connectivity is demonstrated using a Raspberry Pi Pico-based system for demonstrating the potential applicability of the developed sensor as a real-time humidity monitoring system for the healthcare sector. Further, the biodegradability analysis of the used textile is evaluated using the soil burial degradation test. The work suggests the potential applicability of the developed flexible and eco-friendly humidity sensor in wearable healthcare devices and other humidity sensing applications.

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Section: Results and Discussionmentioning

confidence: 99%

Eco-Friendly Textile-Based Wearable Humidity Sensor with Multinode Wireless Connectivity for Healthcare Applications

Beniwal,

Khandelwal,

Mukherjee

et al. 2024

ACS Appl. Bio Mater.

Self Cite

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“…Some authors have attempted to further improve the gas sensing capabilities of electrospun single-phase MOS nanofibers [144], MOS composite nanofibers [145,146], and rGO-loaded MOS nanofibers [147] by functionalization of the nanofibers with metal nanoparticles. For this purpose, they chose also the routes 1 and 2 in Figure 7, leading to the dispersion of the metal nanoparticles, formed in-situ or pre-formed, in the solution with the polymer, inorganic precursors, and eventually rGO.…”

Section: Functionalization Of 1d Metal Oxide Nanostructuresmentioning

confidence: 99%

One-Dimensional Metal Oxide Nanostructures for Chemical Sensors

Hontañón¹,

Vallejos²

2022

21st Century Nanostructured Materials - Physics, Chemistry, Classification, and Emerging Applications in Industry, Biomedicine,

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The fabrication of chemical sensors based on one-dimensional (1D) metal oxide semiconductor (MOS) nanostructures with tailored geometries has rapidly advanced in the last two decades. Chemical sensitive 1D MOS nanostructures are usually configured as resistors whose conduction is altered by a charge-transfer process or as field-effect transistors (FET) whose properties are controlled by applying appropriate potentials to the gate. This chapter reviews the state-of-the-art research on chemical sensors based on 1D MOS nanostructures of the resistive and FET types. The chapter begins with a survey of the MOS and their 1D nanostructures with the greatest potential for use in the next generation of chemical sensors, which will be of very small size, low-power consumption, low-cost, and superior sensing performance compared to present chemical sensors on the market. There follows a description of the 1D MOS nanostructures, including composite and hybrid structures, and their synthesis techniques. And subsequently a presentation of the architectures of the current resistive and FET sensors, and the methods to integrate the 1D MOS nanostructures into them on a large scale and in a cost-effective manner. The chapter concludes with an outlook of the challenges facing the chemical sensors based on 1D MOS nanostructures if their massive use in sensor networks becomes a reality.

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“…ZnO is one of the first ceramic oxide NFs that is fabricated using the electrospinning process. Among many electrospun metal oxide NFs, ZnO NFs are widely used for sensing various gases such as ammonia, [12] nitrogen dioxide, [13,14] methane, [15] acetone, [16] hydrogen, [17] hydrogen sulfide, [18] carbon dioxide, [19] ethanol, [20] and carbon monoxide. [21,22] The ZnO is advantageous over the other metal oxides for gas sensing due to its n-type semiconducting nature with a bandgap of 3.37 eV.…”

Section: Introductionmentioning

confidence: 99%

Electrospun ZnO Nanofiber Based Resistive Gas/Vapor Sensors -A Review

Prabhu¹,

Chandra²,

Rajendra³

et al. 2022

Eng. Sci.

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Resistive zinc oxide (ZnO) sensors play a pivotal role in detecting various gases and vapors due to their high response, low cost, stability, tunability, and simple fabrication. Hence, it is necessary to know the recent status of research in resistive ZnO sensors. The sensitivity is determined by the reactions at the surface of the nanofiber (NF); therefore, the surface area defines the foremost sensor characteristics. Electrospun metal oxide NFs exhibit a high surface area and unique electrical properties that can be tuned, and they are highly sought as the materials for resistive gas sensors. So far, various strategies are adopted to improve the sensitivity and the selectivity of ZnO NFs. This review summarizes the recent methods utilized by various researchers to improve the sensitivity of the ZnO electrospun metal oxide NF-based resistive gas sensors. Also, it discusses the influence of process parameters on the structure and morphology of ZnO NFs, the mechanism of gas sensing and highlights its improvement through advanced methods. The sensitivity of the NF has been improved through tuning the structure and morphology of NFs and doping. Further, modification of NF sensitivity through functionalization, the addition of carbon nanomaterials, and high-energy irradiation are also discussed. Based on the recent literature, the performance of doped ZnO NF for various gas sensing is highlighted. The outcome of this review gives insight to academic researchers and industry for further investigation and development in resistive gas sensors and its applications.

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Enhancing room temperature ethanol sensing using electrospun Ag-doped SnO2–ZnO nanofibers

Cited by 10 publications

References 48 publications

Eco-Friendly Textile-Based Wearable Humidity Sensor with Multinode Wireless Connectivity for Healthcare Applications

Eco-Friendly Textile-Based Wearable Humidity Sensor with Multinode Wireless Connectivity for Healthcare Applications

One-Dimensional Metal Oxide Nanostructures for Chemical Sensors

Electrospun ZnO Nanofiber Based Resistive Gas/Vapor Sensors -A Review

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