Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Li, Min; Kan, Hao; Chen, Shutian; Feng, Xiaoying; Li, Hui; Li, Chong; Fu, Chen; Quan, Aojie; Sun, Hong‐Bo; Luo, Jingting; Liu, Xueli; Wang, Wen; Liu, Huan; Wei, Qiuping; Fu, Yong

doi:10.1016/j.snb.2019.02.042

Cited by 65 publications

(39 citation statements)

References 52 publications

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“…The frequency shis of SAW sensor is mainly dependent on the following three factors: mass load, elastic changes in elasticity and acousto-electric interaction. 21,22 The equation representing the contributions of these three factors is:…”

Section: Resultsmentioning

confidence: 99%

Stability studies of ZnO and AlN thin film acoustic wave devices in acid and alkali harsh environments

Xiong

Zhou

et al. 2020

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Stability studies of ZnO and AlN thin film acoustic wave devices in acid and alkali harsh environments

Xiong

Zhou

et al. 2020

RSC Adv.

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“…Also, it can be observed that the heat treatment applied to the films considerably improves their properties, especially for the films with QDs. This heat treatment has the role of removing organic residues present in the film from the solvents used and promoting the penetration of gas molecules in the volume of the film, due to the formation of cracks on their surface [11].…”

Section: Resultsmentioning

confidence: 99%

“…QDs are crystalline nanoparticles with small sizes (1–12 nm) [10]. Considering this aspect, the use of QDs for the synthesis of sensitive films represents a relatively new and interesting direction of research [11,12]. One of the synthesis methods for QDs, which ensures the control of the morphology and high purity, is pulsed laser deposition (PLD) [13,14].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films

Constantinoiu

Viespe

2019

Sensors

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Regarding the use of hydrogen as a fuel, it is necessary to measure its concentration in air at room temperature. In this paper, sensitive composite films have been developed for surface acoustic wave (SAW) sensors, using quantum dots (QDs) and polymers. Si/SiO2 QDs were used due to having a high specific surface area, which considerably improves the sensitivity of the sensors compared to those that only have a polymer. Si/SiO2 QDs were obtained by laser ablation and analyzed by X-ray diffraction and transmission electron microscopy (TEM). Two types of polymers were used: polydimethylsiloxane (PDMS) and polymethylmethacrylate (PMMA). Polymer and polymer with QDs compositions were deposited on the sensor substrate by drop casting. A heat treatment was performed on the films at 80 °C with a thermal dwell of two hours. The sensors obtained were tested at different hydrogen concentrations at room temperature. A limit of detection (LOD) of 452 ppm was obtained by the sensor with PDMS and Si/SiO2 QDs, which was heat treated. The results demonstrated the potential of using QDs to improve the sensitivity of the SAW sensors and to achieve a heat treatment that increases its adsorption capacity of the gas molecules.

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“…The LOD of the Ag/PPy L-SAW sensors (defined as the concentration providing a signal-to-noise ratio of at least three [23]) was estimated to be 3, 5 and 20 ppb for acetone, ethanol and toluene, respectively. These LOD are below the limits set for acetone, ethanol and toluene in different areas.…”

Section: Gas Sensing Properties Of the L-saw Sensorsmentioning

confidence: 99%

Love Wave Sensors with Silver Modified Polypyrrole Nanoparticles for VOCs Monitoring

Šetka

Bahos

Matatagui

et al. 2020

Sensors

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Love wave sensors with silver-modified polypyrrole nanoparticles are developed in this work. These systems prove functional at room temperature with enhanced response, sensitivity and response time, as compared to other state-of-the-art surface acoustic wave (SAW) sensors, towards volatile organic compounds (VOCs). Results demonstrate the monitoring of hundreds of ppb of compounds such as acetone, ethanol and toluene with low estimated limits of detection (~3 ppb for acetone). These results are attributed to the use of silver-modified polypyrrole as a second guiding/sensitive layer in the Love wave sensor structure, which provides further chemically active sites for the gas-solid interactions. The sensing of low VOCs concentrations by micro sensing elements as those presented here could be beneficial in future systems for air quality control, food quality control or disease diagnosis via exhaled breath as the limits of detection obtained are within those required in these applications.

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Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Abstract: Highlights the trapping of NO2 molecules in the porous structure and thus making the film stiffer. Moreover, the Pb(NO3)2-treated sensor showed good stability and selectivity at room temperature.

Cited by 65 publications

References 52 publications

Stability studies of ZnO and AlN thin film acoustic wave devices in acid and alkali harsh environments

Stability studies of ZnO and AlN thin film acoustic wave devices in acid and alkali harsh environments

Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films

Love Wave Sensors with Silver Modified Polypyrrole Nanoparticles for VOCs Monitoring

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