Synthesis of CdS:Cu5% thin films by chemical method based on silicon for gas sensor applications

Madlul, Safaa Farhood; Mahan, Nazar Khalaf; Ali, Ehab M.; Ahmed, N.

doi:10.1016/j.matpr.2021.03.170

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…Among the deposition methods, the drop-casting method was used in this study because of its simplicity, low cost, and relatively low precipitation temperature. (20) The drop-casting method became well known for creating semiconductors with an excellent crystallite structure, thus enhancing device performance. (21) In this study, SnO 2 was used as a base material, and Au nanoparticles were used as a catalyst to enhance the sensing response.…”

Section: Introductionmentioning

confidence: 99%

Gold-nanoparticle-decorated Tin Oxide of a Gas Sensor Material for Detecting Low Concentrations of Hydrogen Sulfide

Rodiawan¹,

Wang²,

Suhdi³

2023

Sensors and Materials

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Hydrogen sulfide (H 2 S) is an offensive-smelling, colorless, and toxic gas that can cause poisoning even in small quantities. In this study, we proposed a sensor that can detect H 2 S with a low composition using SnO 2 and Au nanoparticles as a catalyst. We investigated the structure formed in the thin layer of a sensing material and determined whether it can absorb the tested gas well and produce a high sensing response. We also determined the optimal operating temperature and showed that it has excellent response and recovery times. Pure SnO 2 was synthesized by a simple thermal decomposition method. In the next step, the wet chemical method was used to dissolve the SnO 2 and Au nanoparticles before a viscous liquid compound was deposited onto the electrode by the drop-casting method. The sensor's performance for H 2 S gas detection was tested at low concentrations with four concentrations of Au nanoparticles on SnO 2 -based materials. The results showed that the structure formed in the thin layer is an agglomeration of hollow grains, which allows the gas to be absorbed properly. The result indicated that 40 µl of Au nanoparticles was the optimum concentration for a H 2 S gas sensor, with responses of 65.12% at 0.2 ppm and 87.34% at 1 ppm. The response time was 8 s, whereas the recovery time was 31 s. Moreover, the optimal operating temperature for the reaction was 200 ℃. The findings of this experiment demonstrated that depositing Au-nanoparticle-decorated SnO 2 by the drop-casting method produced a structure with superior gas-sensing performance.

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Section: Introductionmentioning

confidence: 99%

Gold-nanoparticle-decorated Tin Oxide of a Gas Sensor Material for Detecting Low Concentrations of Hydrogen Sulfide

Rodiawan¹,

Wang²,

Suhdi³

2023

Sensors and Materials

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“…Wurtzite cadmium sulfide is a typical II–VI direct bandgap semiconductor with a bandgap of 2.4 eV. [ 1 ] Due to its suitable bandgap value and good stability as well as the good photoresponse and high sensitivity in the visible light range, cadmium sulfide is widely used in the fields of photocatalysis, [ 2,3 ] solar cells, [ 4–7 ] sensors, [ 8,9 ] and light‐emitting devices. [ 10,11 ] Recently, it has been found that cadmium sulfide shows lots of novel phenomena with the reduction of dimension and size: it is found that CdSe/CdS quantum dots can be used as copper ion fluorescent probe with superior sensitivity; [ 12 ] it is reported that the CdS nanoribbons with thicknesses ranging from 10 to 60 nm have faster photoresponse speed than the bulk and the conventional films; [ 13 ] it is proposed that an ideal architecture, ultrathin nanoflake arrays, can significantly improve the gas‐sensing properties of CdS material.…”

Section: Introductionmentioning

confidence: 99%

Crystalline and Electronic Structures of Ultrathin Cadmium Sulfide Films

Wang

Chen

Gao

et al. 2022

Physica Rapid Research Ltrs

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Herein, the crystalline and electronic structures of ultrathin cadmium sulfide {0001} films with thickness ranging from 1 to 14 Cd–S bilayers are studied using first‐principles calculations method. After structural relaxation, the film composed of 1 Cd–S bilayer is transformed into a CdS monolayer with flat honeycomb structure. Those 2‐ to 5‐bilayer films do not maintain the Wurtzite structure either: the distance between the sulfur and cadmium layers in each bilayer is compressed while the Cd–S bond length between adjacent bilayers is enlarged. These 1‐ to 5‐bilayer films reveal semiconducting characteristics in band structures, and their bandgaps are widened in some degree compared with the bulk. The films with 6–14 Cd–S bilayers keep the Wurtzite structure of the bulk, and exhibit metallic surface states due to the polarity of the films. The results could provide a new insight for the electronic structure regulation of cadmium sulfide.

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A two-dimensional nanomaterial-based fiber optic sensor for humidity and gas sensing application in-depth review

Venkatesan,

Samikannu

2024

Phys. Scr.

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The incredible characteristics of nanomaterial and the benefits of optical fiber may becoupled to provide an exciting new platform for sensing applications. In recent years, there has been significant development and documentation of numerous gas and humidity sensors utilizing optical fiber based on 2D nanomaterials. This review primarily examines the most recent implementations in fiberoptic gas and humidity sensing through 2D nanomaterials. With the help of nanomaterial, researchers may be able to fine-tune sensor parameters like thickness, roughness, specific area, refractive index, etc. This could make it possible for sensors to respond faster or to be more sensitive than standard sensors. Optical sensors are a family of devices that use different types of light interactions (i.e., photon–atom) to sense, analyze, and measure molecules for various purposes. Optical sensors are capable of detecting light, often within a narrow band of the electromagnetic spectrum (ultraviolet, visible, and infrared). A fiber optic sensor is an optical device that transforms the physical state of the object being measured into a quantifiable optical signal. Based on the photoelectric effect, the sensor detects light’s wavelength, frequency, or polarisation and transforms it into an electric signal. This review describes the state-of the-art research in this rapidly evolving sector, impacting sensor type, structure, synthesis, deposition process, detection range, sensitivity, response & recovery time, and application of 2D materials. Lastly, the problems that are currently in the way of using 2D materials in sensor applications are talked about,as well as what the future might hold.

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Synthesis of CdS:Cu5% thin films by chemical method based on silicon for gas sensor applications

Cited by 5 publications

References 11 publications

Gold-nanoparticle-decorated Tin Oxide of a Gas Sensor Material for Detecting Low Concentrations of Hydrogen Sulfide

Gold-nanoparticle-decorated Tin Oxide of a Gas Sensor Material for Detecting Low Concentrations of Hydrogen Sulfide

Crystalline and Electronic Structures of Ultrathin Cadmium Sulfide Films

A two-dimensional nanomaterial-based fiber optic sensor for humidity and gas sensing application in-depth review

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