Influence of the deposition parameters of graphene oxide nanofilms on the kinetic characteristics of the SAW humidity sensor

Balashov, S. M.; Balachova, O. V.; Braga, Angélica de Fátima de Assunção; Filho, Aristides Pavani; Moshkalev, Stanislav A.

doi:10.1016/j.snb.2014.11.050

Cited by 20 publications

(11 citation statements)

References 9 publications

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“…The PCB with ARDUINO controller 3) for frequency and temperature measurements (temperature step is equal to 0.3 degree) and all necessary electronic components were placed near to the SAW sensor, which generated additional heat flow. A special locking system 2) was designed to allow for rapid changes of the humidity level by introducing into the chamber humidity standards in the form of saturated solutions of different salts (Balashov et al, 2015). The entire system mimics the functioning of a typical industrial sensor in the environment where the necessity to maintain the conditions of the industrial process leads to temperature and pressure gradients, which cannot be eliminated.…”

Section: Methodsmentioning

confidence: 99%

Improved Stability and Performance of Surface Acoustic Wave Nanosensors Using a Digital Temperature Compensation

Balashov

Rocha²,

Hurtado³

et al. 2021

Front. Sens.

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Surface Acoustic Waves (SAW) sensors are known to be an excellent choice for the measurement of a small concentration of analytes in gas mixtures. The use of this type of sensor has been limited until now in the industrial environment due to the sensitivity of its response to temperature variations. To overcome this problem, thermal stabilization of equipment is normally used. We propose here a simple procedure of compensation of thermal drift in SAW sensors, allowing the measurements to be performed in temperature intervals of up to 20 degrees without any thermal stabilization of the sensitive element of a sensor. By monitoring the temperature of the key points of the sensor and applying the proposed polynomial compensation, it is possible to reduce the influence of thermal instabilities of the ambient temperature to the response more than four times. The method is illustrated by a temperature compensated SAW humidity sensor with a graphene oxide nanofilm as water molecules’ sensitive element. The results show enhanced performance of the sensor over a large temperature interval.

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Section: Methodsmentioning

confidence: 99%

Improved Stability and Performance of Surface Acoustic Wave Nanosensors Using a Digital Temperature Compensation

Balashov

Rocha²,

Hurtado³

et al. 2021

Front. Sens.

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“…Graphene-based gas sensors [ 100 , 101 , 102 , 103 ] are extensively studied by various research groups. The principle detection mechanism is based on conductivity shifts due to adsorbed gas molecules which change the electron density.…”

Section: Chemical Recognition Layersmentioning

confidence: 99%

Surface Acoustic Wave (SAW) for Chemical Sensing Applications of Recognition Layers

Mujahid

Dickert

2017

Sensors

146

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Surface acoustic wave (SAW) resonators represent some of the most prominent acoustic devices for chemical sensing applications. As their frequency ranges from several hundred MHz to GHz, therefore they can record remarkably diminutive frequency shifts resulting from exceptionally small mass loadings. Their miniaturized design, high thermal stability and possibility of wireless integration make these devices highly competitive. Owing to these special characteristics, they are widely accepted as smart transducers that can be combined with a variety of recognition layers based on host-guest interactions, metal oxide coatings, carbon nanotubes, graphene sheets, functional polymers and biological receptors. As a result of this, there is a broad spectrum of SAW sensors, i.e., having sensing applications ranging from small gas molecules to large bio-analytes or even whole cell structures. This review shall cover from the fundamentals to modern design developments in SAW devices with respect to interfacial receptor coatings for exemplary sensor applications. The related problems and their possible solutions shall also be covered, with a focus on emerging trends and future opportunities for making SAW as established sensing technology.

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“…Although the existing methods of drop casting 29,30 , spin coating 22 , and dip coating 2 are simple, the uniformity and thickness of the GO films formed on devices by these methods are difficult to accurately control, especially when the piezoelectric material is hydrophobic and the surface of the piezoelectric layer is covered with electrodes. Using ink-jet printing 23 , spray coating 31 , and ultrasonic atomization 32 , the thickness of GO films can be controlled, but the obtained GO films still have poor uniformity. In summary, because of the limitation of the surface structure of the SAW device and the hydrophobicity of the piezoelectric material, it is difficult to directly deposit a uniform and thickness-controllable GO film on the surface of the AlN SAW device.…”

Section: Introductionmentioning

confidence: 99%

Surface acoustic wave humidity sensors based on uniform and thickness controllable graphene oxide thin films formed by surface tension

Liu

Peng

et al. 2019

Microsyst Nanoeng

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Graphene oxide (GO) is a promising candidate for humidity sensing, and the uniformity and thickness of GO films are important for the reproducibility and test signal strength of humidity sensors. In this paper, uniform and thickness-controllable GO films are first formed by the surface tension of different concentrations of GO solution and then transferred to surface acoustic wave (SAW) humidity sensors. This GO film formation and transfer process has very good repeatability and stability, as evidenced by the humidity response of the sensors. With the help of the uniform and highly oxidized GO film, the humidity sensors show a significantly high sensitivity (absolute sensitivity of 25.3 kHz/%RH and relative sensitivity of 111.7 p.p.m./%RH) in a wide test range from 10%RH to 90%RH with very little hysteresis (<1%RH). The sensors achieve good reversibility, excellent short-term repeatability and stability. Moreover, the humidity sensors also show a fast response and recovery time of <10 s.

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Influence of the deposition parameters of graphene oxide nanofilms on the kinetic characteristics of the SAW humidity sensor

Cited by 20 publications

References 9 publications

Improved Stability and Performance of Surface Acoustic Wave Nanosensors Using a Digital Temperature Compensation

Improved Stability and Performance of Surface Acoustic Wave Nanosensors Using a Digital Temperature Compensation

Surface Acoustic Wave (SAW) for Chemical Sensing Applications of Recognition Layers

Surface acoustic wave humidity sensors based on uniform and thickness controllable graphene oxide thin films formed by surface tension

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