In Situ Localized Growth of Porous Tin Oxide Films on Low Power Microheater Platform for Low Temperature CO Detection

Long, Hu; Harley‐Trochimczyk, Anna; He, Tianyi; Pham, Thang; Tang, Zirong; Shi, Tielin; Zettl, Alex; Mickelson, William; Carraro, Carlo; Maboudian, Roya

doi:10.1021/acssensors.5b00302

Cited by 66 publications

(54 citation statements)

References 35 publications

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“…Incomplete recovery of the sensor leads to an unreliable sensing output in practical applications. Heating the sensing material with a microfabricated heater can enhance the reversibility of the sensor and accelerate the response and recovery rates, while maintaining low power consumption a shows the sensor response to 0.5 ppm NO 2 at various heating temperatures, ranging from room temperature to 200 °C.…”

Section: Resultsmentioning

confidence: 99%

“…Faster response and recovery can be achieved by heating the sensing material, which increases the desorption rate of the adsorbed species. In order to keep the sensor power consumption low, a microfabricated heater is typically used for the heating . But integration of single‐layer materials onto a microfabricated heater platform can be difficult and the surface area is limited to the heater footprint.…”

Section: Introductionmentioning

confidence: 99%

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High Surface Area MoS₂/Graphene Hybrid Aerogel for Ultrasensitive NO₂ Detection

Long

Harley‐Trochimczyk

Pham

et al. 2016

Adv Funct Materials

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412

245

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A MoS 2 /graphene hybrid aerogel synthesized with two-dimensional MoS 2 sheets coating a high surface area graphene aerogel scaffold is characterized and used for ultrasensitive NO 2 detection. The combination of graphene and MoS 2 leads to improved sensing properties with the graphene scaffold providing high specifi c surface area and high electrical and thermal conductivity and the single to few-layer MoS 2 sheets providing high sensitivity and selectivity to NO 2 . The hybrid aerogel is integrated onto a low-power microheater platform to probe the gas sensing performance. At room temperature, the sensor exhibits an ultralow detection limit of 50 ppb NO 2 . By heating the material to 200 °C, the response and recovery times to reach 90% of the fi nal signal decrease to <1 min, while retaining the low detection limit. The MoS 2 / graphene hybrid also shows good selectivity for NO 2 against H 2 and CO, especially when compared to bare graphene aerogel. The unique structure of the hybrid aerogel is responsible for the ultrasensitive, selective, and fast NO 2 sensing. The improved sensing performance of this hybrid aerogel also suggests the possibility of other 2D material combinations for further sensing applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Surface Area MoS₂/Graphene Hybrid Aerogel for Ultrasensitive NO₂ Detection

Long

Harley‐Trochimczyk

Pham

et al. 2016

Adv Funct Materials

Self Cite

412

245

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show abstract

“…The LSN membrane thermally isolates the heated sensing area and minimizes the heat loss through conduction to the silicon substrate. Full fabrication details and heater characterization can be found elsewhere . By using this design, the microheater sensor requires only ≈4.4 mW to reach 200 °C.…”

Section: Resultsmentioning

confidence: 99%

3D MoS₂ Aerogel for Ultrasensitive NO₂ Detection and Its Tunable Sensing Behavior

Long

Chan

Harley‐Trochimczyk

et al. 2017

Adv Materials Inter

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A high‐performance NO2 sensor based on the 3D MoS2 aerogel is presented. Compared to single‐ or few‐layer MoS2, 3D assemblies of 2D MoS2 provide more surface area per footprint with a simple and scalable synthesis. Integration of the 3D MoS2 aerogel on a low‐power microheater platform is demonstrated, and the sensing behavior of the 3D MoS2 aerogel is investigated. A two‐step sulfurization treatment is developed to obtain a high‐quality MoS2 aerogel with strong sensing performance. The aerogel exhibits low detection limit (50 ppb) toward NO2 at room temperature, while after the two‐step sulfurization treatment, it also exhibits fast response and recovery at low heater temperature of 200 °C, with no decrease in sensitivity. The observed p‐type sensing behavior of MoS2 aerogel is investigated and identified as being controlled by the defect state (as probed by the S:Mo ratio). It is demonstrated that annealing in a hydrogen environment changes the defect state of the MoS2 aerogel by creating more sulfur vacancies; concomitantly, a transition from p‐type sensing behavior to n‐type sensing is observed.

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“…It is well known, that the gas response of the sensor can often be significantly enhanced by chemical modification of the metal oxide’s surface 27–29 . In particular, finely dispersed clusters of noble metals (such as Pt, Pd, Au) may serve as catalysts for the chemical reaction between the analyze gas molecules with semiconductor 30–35 .…”

Section: Introductionmentioning

confidence: 99%

One-step Synthesis of Ordered Pd@TiO2 Nanofibers Array Film as Outstanding NH3 Gas Sensor at Room Temperature

Huang

Zhou

et al. 2017

Sci Rep

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The one dimensional (1D) ordered porous Pd@TiO2 nanofibers (NFs) array film have been fabricated via a facile one-step synthesis of the electrospinning approach. The Pd@TiO2 NFs (PTND3) contained Pd (2.0 wt %) and C, N element (16.2 wt %) display high dispersion of Pd nanoparticles (NPs) on TiO2 NFs. Adding Pd meshed with C, N element to TiO2 based NFs might contribute to generation of Lewis acid sites and Brønsted acid sites, which have been recently shown to enhance NH3 adsorption-desorption ability; Pd NPs could increase the quantity of adsorbed O2 on the surface of TiO2 based NFs, and accelerated the O2 molecule-ion conversion rate, enhanced the ability of electron transmission. The response time of PTND3 sensor towards 100 ppm NH3 is only 3 s at room temperature (RT). Meantime, the response and response time of the PTND3 to the NH3 is 1 and 14s even at the concentration of 100 ppb. Therefore, the ordered Pd@TiO2 NFs array NH3 sensor display great potential for practical applications.

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In Situ Localized Growth of Porous Tin Oxide Films on Low Power Microheater Platform for Low Temperature CO Detection

Cited by 66 publications

References 35 publications

High Surface Area MoS₂/Graphene Hybrid Aerogel for Ultrasensitive NO₂ Detection

High Surface Area MoS₂/Graphene Hybrid Aerogel for Ultrasensitive NO₂ Detection

3D MoS₂ Aerogel for Ultrasensitive NO₂ Detection and Its Tunable Sensing Behavior

One-step Synthesis of Ordered Pd@TiO2 Nanofibers Array Film as Outstanding NH3 Gas Sensor at Room Temperature

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In Situ Localized Growth of Porous Tin Oxide Films on Low Power Microheater Platform for Low Temperature CO Detection

Cited by 66 publications

References 35 publications

High Surface Area MoS2/Graphene Hybrid Aerogel for Ultrasensitive NO2 Detection

High Surface Area MoS2/Graphene Hybrid Aerogel for Ultrasensitive NO2 Detection

3D MoS2 Aerogel for Ultrasensitive NO2 Detection and Its Tunable Sensing Behavior

One-step Synthesis of Ordered Pd@TiO2 Nanofibers Array Film as Outstanding NH3 Gas Sensor at Room Temperature

Contact Info

Product

Resources

About

High Surface Area MoS₂/Graphene Hybrid Aerogel for Ultrasensitive NO₂ Detection

High Surface Area MoS₂/Graphene Hybrid Aerogel for Ultrasensitive NO₂ Detection

3D MoS₂ Aerogel for Ultrasensitive NO₂ Detection and Its Tunable Sensing Behavior