Phase tuned synthesis of titanium dioxide nanoparticles for room temperature enhanced ammonia detection

AbstractThis study demonstrates the fabrication of self-aligning three-dimensional (3D) platinum bridges for ammonia gas sensing using gas-phase electrodeposition. This deposition scheme can guide charged nanoparticles to predetermined locations on a surface with sub-micrometer resolution. A shutter-free deposition is possible, preventing the use of additional steps for lift-off and improving material yield. This method uses a spark discharge-based platinum nanoparticle source in combination with sequentially biased surface electrodes and charged photoresist patterns on a glass substrate. In this way, the parallel growth of multiple sensing nodes, in this case 3D self-aligning nanoparticle-based bridges, is accomplished. An array containing 360 locally grown bridges made out of 5 nm platinum nanoparticles is fabricated. The high surface-to-volume ratio of the 3D bridge morphology enables fast response and room temperature operated sensing capabilities. The bridges are preconditioned for ~ 24 h in nitrogen gas before being used for performance testing, ensuring drift-free sensor performance. In this study, platinum bridges are demonstrated to detect ammonia (NH3) with concentrations between 1400 and 100 ppm. The sensing mechanism, response times, cross-sensitivity, selectivity, and sensor stability are discussed. The device showed a sensor response of ~ 4% at 100 ppm NH3 with a 70% response time of 8 min at room temperature.

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An ionic liquid-based nanofluid of titanium dioxide nanoparticles for effervescence-assisted dispersive liquid–liquid extraction for acaricide detection

Journal of Chromatography A ◽

10.1016/j.chroma.2017.03.005 ◽

2017 ◽

Vol 1497 ◽

pp. 1-8 ◽

Cited By ~ 18

Author(s):

Xiaoling Wu ◽

Xin Li ◽

Miyi Yang ◽

Haozhe Zeng ◽

Sanbing Zhang ◽

...

Keyword(s):

Ionic Liquid ◽

Titanium Dioxide ◽

Titanium Dioxide Nanoparticles ◽

Liquid Extraction ◽

Liquid Liquid Extraction

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Novel Zinc-Based Infinite Coordination Polymer for Highly Selective Ammonia Gas Sensing at Room Temperature

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.20200132 ◽

2020 ◽

Vol 93 (9) ◽

pp. 1070-1073

Author(s):

Yuming Zhao ◽

Lei Shao ◽

Linlin Li ◽

Sha Wang ◽

Guoshuai Song ◽

...

Keyword(s):

Coordination Polymer ◽

Room Temperature ◽

Gas Sensing ◽

Ammonia Gas

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Ammonia Gas Detection by Tannic Acid Functionalized and Reduced Graphene Oxide at Room Temperature

Journal of Nanomaterials ◽

10.1155/2014/497384 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 40

Author(s):

Sweejiang Yoo ◽

Xin Li ◽

Yuan Wu ◽

Weihua Liu ◽

Xiaoli Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Gas Sensor ◽

Tannic Acid ◽

Room Temperature ◽

Gas Sensing ◽

High Sensitivity ◽

Gas Detection ◽

Ammonia Gas ◽

Reduced Graphene

Reduced graphene oxide (rGO) based chemiresistor gas sensor has received much attention in gas sensing for high sensitivity, room temperature operation, and reversible. Here, for the first time, we present a promising chemiresistor for ammonia gas detection based on tannic acid (TA) functionalized and reduced graphene oxide (rGOTA functionalized). Green reductant of TA plays a major role in both reducing process and enhancing the gas sensing properties ofrGOTA functionalized. Our results showrGOTA functionalizedonly selective to ammonia with excellent respond, recovery, respond time, and recovery times.rGOTA functionalizedelectrical resistance decreases upon exposure to NH3where we postulated that it is due to n-doping by TA and charge transfer betweenrGOTA functionalizedand NH3through hydrogen bonding. Furthermore,rGOTA functionalizedhinders the needs for stimulus for both recovery and respond. The combination of greener sensing material and simplicity in overall sensor design provides a new sight for green reductant approach of rGO based chemiresistor gas sensor.

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