Indium-tin-oxide single-nanowire gas sensor fabricated via laser writing and subsequent etching

Afshar, Maziar; Preiß, Elisabeth M.; Sauerwald, Tilman; Rodner, Marius; Feili, Dara; Straub, Martin; König, Karsten; Schütze, Andreas; Seidel, Helmut

doi:10.1016/j.snb.2015.03.067

Cited by 41 publications

(30 citation statements)

References 21 publications

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“…The early works exploring the effects of Joule heating in thin films (reporting moderate heating with large amounts of power dissipated) suggested [56] and the more recent works, (exploring the possibility of shrinking the conduction path of a thin film in a top-down attempt to build up an energy efficient wire) confirmed [74] that the thermal losses by conduction with the substrate and/or the contacts are the major threat for the self-heating efficiency. To circumvent this problem and optimize the heating efficiency, some authors chose to separate the material from the substrate in suspended configurations [12].…”

Section: Thermal Loses With the Substratementioning

confidence: 99%

“…From then on, a number of papers reported significant energy savings in gas sensing applications, by using this efficient self-heating approach in a great variety of materials, like metal oxides, carbon-based materials and metal catalysts [12,53,61,62,[65][66][67]69,71,[73][74][75][76][77][78][79][80][81].…”

Section: Low Power Consumptionmentioning

confidence: 99%

“…Relying on the idea that the minute dimensions of the nanowire were the exclusive responsible for efficient self-heating, Afshar et al [74] attempted the top-down fabrication of wires based on an In2O3 thin film etched down to form a 100 nm wide conduction channel using laser writing lithography. Despite the resemblance to the single wire scenario, this kind of devices requires much larger amounts of power to exhibit significant heating leading to a valuable conclusion: thermal isolation of the self-heated channel is crucial.…”

Section: Limitations: the Challenge Of Integrationmentioning

confidence: 99%

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A review on efficient self-heating in nanowire sensors: Prospects for very-low power devices

Fàbrega

Hernández-Ramírez

Prades

2018

Sensors and Actuators B: Chemical

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Self-heating operation, or the use of the resistance-probing signal to warm up and control the temperature of nanowire devices, has been the subject of research for more than a decade. In this review, we summarize the most relevant achievements reported to date in the specialized literature. The state-of-the-art shows that this approach is serving to lower the power demand in temperature-activated devices, especially in conductometric gas sensors, but the simplicity of eliminating the heating element comes with the complexity of integrating 1-dimensional nanomaterials in electronic devices. Results show however that this is feasible, and in some cases, even cost-effective. To contribute to the further development and optimization of the self-heating approach, we compile here a set of recommendations on how to increase the efficiency of the future devices. These suggestions aim at clarifying the impact on the power efficiency of factors like the nanowire cross-section, the electrical and thermal conductivities of the material, the thermal insulation characteristics, and the operating conditions. To facilitate the comparison of the performances obtained in past and future works, we also propose a figure of merit: the efficient self-heating coefficient (ESH), which accounts for the maximum temperature increase (in Kelvin) per microwatt of Joule power dissipated in the material. In this way, ESH values about 1 or above are indicative of highly efficient technologies, capable of raising the temperature over hundreds of degrees with less than a milliwatt of dissipated power.

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Section: Thermal Loses With the Substratementioning

confidence: 99%

Section: Low Power Consumptionmentioning

confidence: 99%

Section: Limitations: the Challenge Of Integrationmentioning

confidence: 99%

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A review on efficient self-heating in nanowire sensors: Prospects for very-low power devices

Fàbrega

Hernández-Ramírez

Prades

2018

Sensors and Actuators B: Chemical

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“…Gases that could be detected under such conditions are NO 2 , NH 3 , H 2 S and a number of short-chain alcohols [1,2,3,4,5,6,7]. In this latter mode of operation UV photo-activation has also been shown to be effective [8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…The integrator-type response, however, seems to be a much less universally observable phenomenon and likely appears only when certain morphological boundary conditions are satisfied. Indications into this latter direction are that nanowire gas sensors exhibit a humidity response which is proportional to the humidity in the gas ambient [43,44] whereas materials with flat surface morphologies seem to be much less able to follow changes in the ambient humidity [7,29,45]. …”

Section: Introductionmentioning

confidence: 99%

Effect of Water Vapor and Surface Morphology on the Low Temperature Response of Metal Oxide Semiconductor Gas Sensors

et al. 2015

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In this work the low temperature response of metal oxide semiconductor gas sensors is analyzed. Important characteristics of this low-temperature response are a pronounced selectivity to acid- and base-forming gases and a large disparity of response and recovery time constants which often leads to an integrator-type of gas response. We show that this kind of sensor performance is related to the trend of semiconductor gas sensors to adsorb water vapor in multi-layer form and that this ability is sensitively influenced by the surface morphology. In particular we show that surface roughness in the nanometer range enhances desorption of water from multi-layer adsorbates, enabling them to respond more swiftly to changes in the ambient humidity. Further experiments reveal that reactive gases, such as NO2 and NH3, which are easily absorbed in the water adsorbate layers, are more easily exchanged across the liquid/air interface when the humidity in the ambient air is high.

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1D Metal Oxide Semiconductor Materials for Chemiresistive Gas Sensors: A Review

Yang

Myung

Tran

2021

Adv Elect Materials

155

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While numerous types of gas sensors have been developed for various industries and applications such as the automotive industry, environmental monitoring, and personal safety, nanoscale chemiresistive gas sensors have gained significant research interest due to several advantages such as high sensitivity, low power consumption, and portability. An essential component of these gas sensors is the sensing material where metal oxide semiconductor (MOS) materials are the most prevalent sensing material. Since the adoption of nanoscale synthesis methods for sensing materials development, such as electrospinning and hydrothermal synthesis, many novel 1D MOS‐based nanostructured sensing materials have been demonstrated to enhance gas sensing performance. Overall, nanoengineering approaches and mechanisms for enhancement of gas sensing performance of 1D metal oxide‐based sensing materials are systematically discussed and categorized into several overarching strategies, such as tuning of materials dimension, morphology, and composition. Furthermore, integration of 1D sensing nanomaterials into sensor devices are discussed from the perspective of different chemiresistive sensor architectures and device fabrication methods. Finally, this review also discusses use of 1D MOS materials for emerging and novel electronic nose applications.

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Indium-tin-oxide single-nanowire gas sensor fabricated via laser writing and subsequent etching

Cited by 41 publications

References 21 publications

A review on efficient self-heating in nanowire sensors: Prospects for very-low power devices

A review on efficient self-heating in nanowire sensors: Prospects for very-low power devices

Effect of Water Vapor and Surface Morphology on the Low Temperature Response of Metal Oxide Semiconductor Gas Sensors

1D Metal Oxide Semiconductor Materials for Chemiresistive Gas Sensors: A Review

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