Shelf Life Study of NiO Nanowire Sensors for NO2 Detection

Kaur, Navpreet; Zappa, Dario; Comini, Elisabetta

doi:10.1007/s13391-019-00172-5

Cited by 14 publications

(11 citation statements)

References 18 publications

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“…However, testing such high concentrations of NO 2 has very low impact for the development of real time NO 2 sensing device, as the dangerous limit for NO 2 is lower than 2 ppm. [29] Furthermore, comparison with the literature (see Table S2, Supporting Information) confirms the superior performance of NWO heterostructures.…”

Section: Gas Sensing Mechanismsupporting

confidence: 54%

“…[25][26][27] Even though this material is rarely investigated, our previous reports on NiO nanowires prove its tremendous potential in the gas sensing field. [28,29] On the other hand, WO 3 is an n-type semiconducting material that has been extensively studied in the gas sensing field thanks to its extremely good sensing capabilities. [30][31][32][33] Specifically, we report for the first time the synthesis of NiO and WO 3 nano-heterostructures using vapor-phase growth method for the selective sensing of acetone and NO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Novel Christmas Branched Like NiO/NiWO₄/WO₃ (p–p–n) Nanowire Heterostructures for Chemical Sensing

Kaur

Zappa

Maraloiu

et al. 2021

Adv Funct Materials

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Establishing a platform comprising different nanostructured oxides is an emerging idea to develop highly sensitive and selective sensing devices. Herein, novel 3D-heterostructures (p-p-n) consisting of 1D nanowires of NiO and WO 3 along with their intermediate reactive product, i.e., NiWO 4 seed, are produced by a two-steps vapor phase growth method. In-depth morphological and structural investigations describing the growth mechanism of these heterostructures are presented. Finally, the p-p-n heterostructures are integrated into conductometric sensing devices and their performances are investigated toward different gases. It is observed that by modulating the charge-carrier transport with temperature, the heterostructure sensors exhibit selective behavior toward different gas analytes. Indeed, at 300 °C, the heterostructure sensors show relatively selective behavior toward NO 2 , while at 400 °C, high selectivity toward VOCs is observed. The improvement in sensing performances is mainly based on charge carrier transport through the two interfaces (one at WO 3 /NiWO 4 (n-p) and the other at NiWO 4 /NiO (p-p)) and the modulation of charge carriers in the electron depletion layer of WO 3 and hole accumulation layer of NiO and NiWO 4 . The remarkable performance of these complex heterostructures with low ppb-level detection limits makes them excellent candidates for chemical/ gas sensing applications in e-noses.

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Section: Gas Sensing Mechanismsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Novel Christmas Branched Like NiO/NiWO₄/WO₃ (p–p–n) Nanowire Heterostructures for Chemical Sensing

Kaur

Zappa

Maraloiu

et al. 2021

Adv Funct Materials

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“…(Right) Sensing response of the NiO nanowire-based sensor over a period of 200 days toward 1 ppm of NO 2 . Adapted with permission from ref ( 78 ). Copyright (2019) Springer.…”

Section: Metal Oxide Nanowire Chemoresistive Gas Sensorsmentioning

confidence: 99%

“…75 One-dimensional nanostructure growth via the VLS or VS mechanism can be achieved using a tubular furnace that is able to reach the high temperatures necessary for material evaporation. 19,77,78 In order to reduce and control the pressure inside the alumina tube, the system must be connected to vacuum pumps. This will reduce the evaporation temperature and avoid the inclusions of unintentional dopants into the growing nanostructures.…”

Section: ■ Fabrication Of Metal Oxide-based One-dimensional Nanostruc...mentioning

confidence: 99%

One-Dimensional Nanostructured Oxide Chemoresistive Sensors

2020

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Day by day, the demand for portable, low cost, and efficient chemical/gas-sensing devices is increasing due to worldwide industrial growth for various purposes such as environmental monitoring and health care. To fulfill this demand, nanostructured metal oxides can be used as active materials for chemical/gas sensors due to their high crystallinity, remarkable physical/chemical properties, ease of synthesis, and low cost. In particular, (1D) one-dimensional metal oxides nanostructures, such as nanowires, exhibit a fast response, selectivity, and stability due to their high surface-to-volume ratio, well-defined crystal orientations, controlled unidirectional electrical properties, and self-heating phenomenon. Moreover, with the availability of large-scale production methods for nanowire growth such as thermal oxidation and evaporation–condensation growth, the development of highly efficient, low cost, portable, and stable chemical sensing devices is possible. In the last two decades, tremendous advances have been achieved in 1D nanostructured gas sensors ever since the pioneering work by Comini on the development of a SnO 2 nanobelt for gas sensor applications in 2002, which is one such example from which many researchers began to explore the field of 1D-nanostructure-based chemical/gas sensors. The Sensor Laboratory (University of Brescia) has made major contributions to the field of metal oxide nanowire chemical/gas-sensing devices. Over the years, different metal oxides such as SnO 2 , ZnO, WO 3 , NiO, CuO, and their heterostructures have been grown for their nanowire morphology and successfully integrated into chemoresistive gas-sensing devices. Hence in this invited feature article, Sensor Laboratory research on the synthesis of metal oxide nanowires and novel heterostructures and their characterization and gas-sensing performance during exposure to different gas analytes has been presented. Moreover, some new strategies such as branched-like nanowire heterostructures and core–shell nanowire structures adopted to enhance the performance of nanowire-based chemical sensor are presented in detail.

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“…Environmentally hazardous oxidizing compounds such as NO 2 , O 3 and CO 2 , etc. are among the major concerns for the human life and health [ 11 , 90 , 91 , 92 , 93 ]. For example, NO 2 is a typical air pollutant byproduct of combustion facilities, aircrafts and automobiles.…”

Section: Chemical Sensing Propertiesmentioning

confidence: 99%

1D Titanium Dioxide: Achievements in Chemical Sensing

et al. 2020

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For the last two decades, titanium dioxide (TiO2) has received wide attention in several areas such as in medicine, sensor technology and solar cell industries. TiO2-based gas sensors have attracted significant attention in past decades due to their excellent physical/chemical properties, low cost and high abundance on Earth. In recent years, more and more efforts have been invested for the further improvement in sensing properties of TiO2 by implementing new strategies such as growth of TiO2 in different morphologies. Indeed, in the last five to seven years, 1D nanostructures and heterostructures of TiO2 have been synthesized using different growth techniques and integrated in chemical/gas sensing. Thus, in this review article, we briefly summarize the most important contributions by different researchers within the last five to seven years in fabrication of 1D nanostructures of TiO2-based chemical/gas sensors and the different strategies applied for the improvements of their performances. Moreover, the crystal structure of TiO2, different fabrication techniques used for the growth of TiO2-based 1D nanostructures, their chemical sensing mechanism and sensing performances towards reducing and oxidizing gases have been discussed in detail.

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Shelf Life Study of NiO Nanowire Sensors for NO2 Detection

Cited by 14 publications

References 18 publications

Novel Christmas Branched Like NiO/NiWO₄/WO₃ (p–p–n) Nanowire Heterostructures for Chemical Sensing

Novel Christmas Branched Like NiO/NiWO₄/WO₃ (p–p–n) Nanowire Heterostructures for Chemical Sensing

One-Dimensional Nanostructured Oxide Chemoresistive Sensors

1D Titanium Dioxide: Achievements in Chemical Sensing

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Shelf Life Study of NiO Nanowire Sensors for NO2 Detection

Cited by 14 publications

References 18 publications

Novel Christmas Branched Like NiO/NiWO4/WO3 (p–p–n) Nanowire Heterostructures for Chemical Sensing

Novel Christmas Branched Like NiO/NiWO4/WO3 (p–p–n) Nanowire Heterostructures for Chemical Sensing

One-Dimensional Nanostructured Oxide Chemoresistive Sensors

1D Titanium Dioxide: Achievements in Chemical Sensing

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Product

Resources

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Novel Christmas Branched Like NiO/NiWO₄/WO₃ (p–p–n) Nanowire Heterostructures for Chemical Sensing

Novel Christmas Branched Like NiO/NiWO₄/WO₃ (p–p–n) Nanowire Heterostructures for Chemical Sensing