Effect of Precursor Concentration on Structural, Morphological, and Optical Properties of ZnO Thin-Filmed Sensor for Ethanol Detection

Murugesan, Sudha; Sankararajan, Radha; Savarimuthu, Kirubaveni; Ramany, Kiruthika; Govindaraj, R.; Santhosh, N.; Ramasamy, P.

doi:10.1109/tnano.2017.2783931

Cited by 16 publications

(13 citation statements)

References 39 publications

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“…The cooled substrates are taken out and washed several times using deionised water. These ZnO nanostructures were grown FTO substrates were once again immersed in the newly prepared nanostructures growth solution using the above mentioned method for the same set of precursor molar concentrations and kept inside the hot air oven at 90°C for 6 h (Sudha et al , 2017). After cooling to room temperature, all the samples 0.025 M (R1), 0.075 M (R2) and 0.125 M (R3) (R – refresh growth method) were annealed at 350°C for 1 h. The ZnO nanostructure-based samples (R1, R2 and R3) fabricated using the refresh hydrothermal method was spin-coated with poly 3,4-ethylenedioxythiophene polystyrene sulfonate (PEDOT: PSS) (2,000 rpm for 30 s).…”

Section: Fabrication Methodologymentioning

confidence: 99%

“…Xiaonan Wen et al experimented with seedless synthesis of patterned ZnO nanowire arrays on metal thin films for flexible electromechanical sensing applications (Xu et al , 2012). Various approaches have been made to alter the vibration sensing properties of ZnO films to achieve high sensitivity (Sudha et al , 2017; Amin et al , 2011; Zhang et al , 2007; Zhang et al , 2007). This research reports the experimental study of the fabrication of precursor molar ratio concentration varied ZnO nanostructures grown on the rigid substrates using the refresh hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of vibration sensors using precursor molar concentration varied ZnO nanostructures grown by refresh hydrothermal method

Gunasekaran¹,

Govindaraj²,

Santhosh³

et al. 2021

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Purpose Various approaches have been made to alter the vibration sensing properties of zinc oxide (ZnO) films to achieve high sensitivity. This paper aims to report the experimental study of the fabrication of precursor molar ratio concentration varied ZnO nanostructures grown on rigid substrates using the refresh hydrothermal method. The effect of these fabricated ZnO nanostructures-based vibration sensors was experimentally investigated using a vibration sensing setup. Design/methodology/approach ZnO nanostructures have been grown using low temperature assisted refresh hydrothermal method with different precursor molar concentrations 0.025 M (R1), 0.075 M (R2) and 0.125 M (R3). Poly 3,4-ethylenedioxythiophene polystyrene sulfonate, a p-type material is spun coated on the grown ZnO nanostructures. Structural analysis reveals the increased intensity of the (002) plane and better c-axis orientation of the R2 and R3 sample comparatively. Morphological examination shows the changes in the grown nanostructures upon increasing the precursor molar concentration. The optical band gap value decreases from 3.11 eV to 3.08 eV as the precursor molar concentration is increased. Photoconductivity study confirms the formation of a p-n junction with less turn-on voltage for all the fabricated devices. A less internal resistance of 0.37 kΩ was obtained from Nyquist analysis for R2 compared with the other two fabricated samples. Vibration testing experimentation showed an improved output voltage of the R2 sample (2.61 V at 9 Hz resonant frequency and 2.90 V for 1 g acceleration) comparatively. This also gave an increased sensitivity of 4.68 V/g confirming its better performance when compared to the other fabricated two samples. Findings Photoconductivity study confirms the formation of a p-n junction with less turn-on voltage for all the fabricated devices. A less internal resistance of 0.37 kΩ was calculated from the Nyquist plot. Vibration testing experimentation proves an increased sensitivity of 4.68 V/g confirming its better performance when compared to the other fabricated two samples. Originality/value Vibration testing experimentation proves an increased sensitivity of 4.68 V/g for R2 confirming its better performance when compared to the other fabricated two samples.

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Section: Fabrication Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of vibration sensors using precursor molar concentration varied ZnO nanostructures grown by refresh hydrothermal method

Gunasekaran¹,

Govindaraj²,

Santhosh³

et al. 2021

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“…The experimental ethanol sensing analysis was done at room temperature using a homemade gas sensing setup reported in the author's previous research (Sudha et al, 2018;Murugesan et al, 2017). The UV source with 365 nm wavelength and power intensity of 1.8 mW/cm 2 was used for the UV sensing measurement.…”

Section: Sensor Experimental Analysismentioning

confidence: 99%

Experimental analysis of UV-activated ethanol sensor based on the formation of organic/inorganic heterojunction

Sankararajan

Savarimuthu

Murugesan

et al. 2020

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Purpose The purpose of this paper is to fabricate an ethanol sensor which has bio-friendly and eco-friendly properties compared to the commercially available ethanol sensors. Design/methodology/approach This paper describes the construction of a highly sensitive ethanol sensor with low ppm level detection at room temperature by integrating three techniques. The first deals with the formation of organic/inorganic p-n heterojunction. Second, tuning of structural parameters such as length, diameter and density of Zinc Oxide (ZnO) nanostructure was achieved through introduction of the Fe dopant into a pure ZnO seed layer. Furthermore, ultra-violet (UV) light photoactivation approach was used for enhancing the sensing performance of the fabricated sensors. Four different sensors were fabricated by combing the above approaches. The structural, morphological, optical and material compositions were characterized using different characterization techniques. Sensing behavior of the fabricated sensors toward ethanol was experimented at room temperature with and without UV illumination combined with stability studies. It was observed that all the fabricated sensors showed enhanced sensing performance for 10 ppm of ethanol. In specific, FNZ (Fe-doped ZnO seeded Ni-doped Zn nanorods) sensor exhibited a higher response at 2.2 and 13.5 s for 5 ppm and 100 ppm of ethanol with UV light illumination at room temperature, respectively. The photoactivated FNZ sensor showed quick response and speedy recovery at 18 and 30 s, respectively, for 100 ppm ethanol. Findings In this study, the authors have experimentally analyzed the effect of Fe (in ZnO seed layer and ZnO NRs) and Ni (in ZnO NRs) dopants in the room temperature sensing performance (with and without UV light) of the fabricated ethanol sensors. Important sensing parameters like sensitivity, recovery and response time of all the fabricated sensors are reported. Originality/value The Fe doped ZnO seeded Ni doped Zn nanorods (FNZ sample) showed a higher response at 2.2 s and 13.5 s for very low 5 ppm and 10 ppm of ethanol at room temperature under UV light illumination when compared to the other fabricated sensors in this paper. Similarly, this sensor also had quick response (18 s) and speedy recovery (30 s) for 100 ppm ethanol.

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“…This solution is then transferred to a stainless steel autoclave and kept inside a hot digital air oven at 90°C for 4 hours and then cooled to room temperature. Finally, the substrate is annealed at 350°C for 1 hour to improve the crystalline nature of the ZnO nanorods grown . Figures and show the XRD and FESEM images of the prepared ZnO nanorods, respectively.…”

Section: Synthesis and Characterization Of Sensitive Materialsmentioning

confidence: 99%

“…Finally, the substrate is annealed at 350 C for 1 hour to improve the crystalline nature of the ZnO nanorods grown. 15 Figures 3 and 4 show the XRD and FESEM images of the prepared ZnO nanorods, respectively.…”

Section: Synthesis and Characterization Of Znomentioning

confidence: 99%

A compact tri‐band microwave resonator for ethanol gas detection

Alsath

Savarimuthu

Erattaiselvam

et al. 2019

Int J RF Microw Comput Aided Eng

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This article presents the design, simulation, fabrication, and testing of a compact two‐port microwave resonator coated with nanomaterials for ethanol gas sensing applications. The proposed gas sensor consists of a transmission line loaded with three triangular split ring resonators for ethanol detection at three frequency bands viz. 2.2, 4.6, and 6.3 GHz. The transmission line has all‐pass characteristics in which band gaps are introduced using three split ring resonators. The TiO2 and ZnO nanorods are used as sensitive layers for the proposed sensing application. The nanorods, which are grown on a glass substrate of thickness 1 mm, are loaded on to the two‐port microwave resonator making the device sensitive to ethanol. The microwave behavior of the sensor is analyzed using the scattering parameters. The absorption of the ethanol gas causes frequency detuning which is used to analyze the presence of ethanol and its concentration. From the experiments, it is understood that there is an increase in the frequency shift with an increase in the concentration of ethanol gas. The sensing device with ZnO as a sensitive layer showed a higher average sensitivity of 2.35 compared to TiO2 whose average sensitivity is 1.29.

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Effect of Precursor Concentration on Structural, Morphological, and Optical Properties of ZnO Thin-Filmed Sensor for Ethanol Detection

Cited by 16 publications

References 39 publications

Fabrication of vibration sensors using precursor molar concentration varied ZnO nanostructures grown by refresh hydrothermal method

Fabrication of vibration sensors using precursor molar concentration varied ZnO nanostructures grown by refresh hydrothermal method

Experimental analysis of UV-activated ethanol sensor based on the formation of organic/inorganic heterojunction

A compact tri‐band microwave resonator for ethanol gas detection

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