AC phase sensing of graphene FETs for chemical vapors with fast recovery and minimal baseline drift

Liu, Huiliang; Liu, Yumeng; Chu, Yao; Hayasaka, Tomoaki; Joshi, Nirav; Cui, Yong; Wang, Xiaohao; You, Zheng; Liu, Lin

doi:10.1016/j.snb.2018.01.244

Cited by 52 publications

(17 citation statements)

References 28 publications

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“…The living standards of the human race in the 20th century grew rapidly due to the industrial revolution. Industrialization demands specific gas detection and monitoring for the benefit of society [ 16 , 18 , 169 , 170 , 171 , 172 , 173 ]. These include hydrocarbons (for the exploration of oil fields), oxygen (for breathable atmospheres and combustion processes, e.g., in boilers and internal combustion engines), and other various gaseous chemicals (for medical applications, manufacturing of different chemicals, etc.).…”

Section: Applications Of Tio 2 and Zno Nanostructuresmentioning

confidence: 99%

“…Nanostructured semiconductor metal oxides are a class of materials that play an important role in the development of most electronic devices such as solar cells, transistors, diodes, and sensors [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Among various metal oxides, ZnO and TiO 2 NPs are of much interest in the scientific community due to the fact of their unique electronic, chemical, and physical properties, their high surface-to-volume ratio, and availability of more surface atoms for an immediate chemical reaction [ 11 , 14 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Green Synthesis and Applications of ZnO and TiO2 Nanostructures

et al. 2021

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Over the last two decades, oxide nanostructures have been continuously evaluated and used in many technological applications. The advancement of the controlled synthesis approach to design desired morphology is a fundamental key to the discipline of material science and nanotechnology. These nanostructures can be prepared via different physical and chemical methods; however, a green and ecofriendly synthesis approach is a promising way to produce these nanostructures with desired properties with less risk of hazardous chemicals. In this regard, ZnO and TiO2 nanostructures are prominent candidates for various applications. Moreover, they are more efficient, non-toxic, and cost-effective. This review mainly focuses on the recent state-of-the-art advancements in the green synthesis approach for ZnO and TiO2 nanostructures and their applications. The first section summarizes the green synthesis approach to synthesize ZnO and TiO2 nanostructures via different routes such as solvothermal, hydrothermal, co-precipitation, and sol-gel using biological systems that are based on the principles of green chemistry. The second section demonstrates the application of ZnO and TiO2 nanostructures. The review also discusses the problems and future perspectives of green synthesis methods and the related issues posed and overlooked by the scientific community on the green approach to nanostructure oxides.

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Section: Applications Of Tio 2 and Zno Nanostructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Green Synthesis and Applications of ZnO and TiO2 Nanostructures

et al. 2021

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“…Recently, 2-D materials have mostly been in focus for gas sensors development due to their outstanding electronic properties [118][119][120][121] . A suitable combination of these 2-D material with oxide nanostructures offers spontaneous electron transfer and ensures that the diffusion of the gas molecule results in improving the sensor response along with optimizing the response/recovery times of the gas sensor 122 .…”

Section: Moo3 Nanoribbons (Nrbs)mentioning

confidence: 99%

Advances in the designs and mechanisms of MoO₃ nanostructures for gas sensors: a holistic review

2021

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“…Materials modifications [15][16][17][18][19], sensors design [20][21][22][23][24], and testing schemes [25][26][27][28][29], were used to improve the performance of gas sensor devices; but only a few [30][31][32] reports on its dependence with the chamber design. This factor is important to efficiently investigate the characteristics of the sensor being tested.…”

Section: Introductionmentioning

confidence: 99%

Influence of chamber design on the gas sensing performance of graphene field-effect-transistor

et al. 2020

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We report on the influence of chamber design on the gas sensing performance of a graphene field-effect-transistor (GFET). A conventional chamber (V = 400 ml) and a cap chamber (V = 1 ml), were used to perform dynamic measurements on a GFET. To gain a-priori knowledge on the gas flow in the chambers, Naiver-Stokes and convection-diffusion equations were numerically-solved using COMSOL Multiphysics. We numerically and experimentally observed two main factors that can affect the GFET performance: (1) the gas flow direction through the chamber and (2) the chamber volume. At 5-min exposure time, at least 200% higher GFET sensitivity was calculated from the cap chamber, which is expected since the conventional chamber is 400 times larger. Interestingly, even when the conventional chamber is fully saturated (at 90-min exposure time), the GFET sensitivity in the cap chamber is still better by 28.57%. We attributed this behavior to the swirling vapor flow in the cap chamber brought about by the U-shaped path. This effect causes multiple interaction of H 2 O molecules with the GFET, resulting to higher computed sensitivity. However, at higher relative humidity, the GFET becomes populated, reducing the number of H 2 O molecules that can re-interact with the sensor. In terms of GFET transient characteristics, a 154% and 86.9% faster response and recovery, respectively, were observed in the cap-design. This was due to its smaller volume that minimized poorly purged region in the chamber. But if the chambers have the same volumes, we may infer a faster GFET response and recovery from the conventional chamber where the gas flow is unperturbed. These results could contribute in designing a time efficient and cost-effective gas sensing system.

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AC phase sensing of graphene FETs for chemical vapors with fast recovery and minimal baseline drift

Cited by 52 publications

References 28 publications

Green Synthesis and Applications of ZnO and TiO2 Nanostructures

Green Synthesis and Applications of ZnO and TiO2 Nanostructures

Advances in the designs and mechanisms of MoO₃ nanostructures for gas sensors: a holistic review

Influence of chamber design on the gas sensing performance of graphene field-effect-transistor

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AC phase sensing of graphene FETs for chemical vapors with fast recovery and minimal baseline drift

Cited by 52 publications

References 28 publications

Green Synthesis and Applications of ZnO and TiO2 Nanostructures

Green Synthesis and Applications of ZnO and TiO2 Nanostructures

Advances in the designs and mechanisms of MoO3 nanostructures for gas sensors: a holistic review

Influence of chamber design on the gas sensing performance of graphene field-effect-transistor

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Product

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Advances in the designs and mechanisms of MoO₃ nanostructures for gas sensors: a holistic review