Study on the physical properties of indium tin oxide thin films deposited by microwave-assisted spray pyrolysis

Zhang, Lihua; Lan, Jianbo; Yang, Jianyu; Guo, Shenghui; Peng, Jinhui; Zhang, Libo; Tian, Shihong; Ju, Sheng; Xie, Wenbin

doi:10.1016/j.jallcom.2017.09.024

Cited by 18 publications

(8 citation statements)

References 31 publications

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“…All the films possess uniform grain distribution throughout the surface of the samples. The size of the grains is enhanced with increasing substrate temperature due to the agglomeration. , The elemental analysis of thin films has been carried out using the energy-dispersive X-ray (EDX) spectrum, which validates the presence of indium and oxygen atoms only. The EDX spectra are shown in Figure a3–d3.…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

Dasari

Nagaraju²,

Vijayakumar

et al. 2021

ACS Omega

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Toluene gas is the most toxic and affects the respiratory system of humans, and thereby, its detection at lower levels is an important task. Herein, we report a room temperature-operatable indium oxide-based chemiresistive gas sensor, which detects 50 ppm toluene vapors. Nanocrystalline indium oxide (In 2 O 3 ) films were sprayed on a precleaned glass substrate using a cost-effective spray pyrolysis method at different substrate temperatures in the range of 350−500 °C. The X-ray diffraction studies confirmed that the sprayed thin films, which were deposited at different substrate temperatures, exhibit a cubic structure. The preferred orientation was aligned along the (222) orientation. Average crystallite size calculation based on the Scherrer formula indicates that the crystallite size increases with the enhancement of substrate temperature. FESEM analysis showed that the indium oxide thin films possess uniform grain distribution, which persists over the entire substrate. As the substrate temperature is increased, a partial agglomeration in the film morphology was observed. The deposited film's nanostructured nature was confirmed by transmission electron microscopy, and the polycrystalline nature was confirmed from the selected area electron diffraction pattern. Root mean square roughness of the samples was determined from the atomic force microscopy studies. From the Raman spectra, characteristic vibrational modes appeared at 558.61, 802.85, and 1097.18 cm −1 in all the samples, which confirms the cubic structure of indium oxide thin films. Photoluminescence emission spectra have been recorded with an excitation wavelength of 280 nm. The optical band gap was measured using the Tauc plot. The band gap was found to decrease with an increase in the substrate temperature. The gas-sensing performance of indium oxide films sprayed at various substrate temperatures has demonstrated a better response toward 50 ppm toluene gas at room temperature with good stability, and the response and recovery times were determined using a transient response curve.

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Section: Resultsmentioning

confidence: 99%

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

Dasari

Nagaraju²,

Vijayakumar

et al. 2021

ACS Omega

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“…Transparent conducting oxides such as indium tin oxide (ITO) are very important. Understanding the interaction between DNA and ITO (also with In 2 O 3 and SnO 2 ) is a key step in the fabrication of electric biosensors . The three types of nanoparticles were all positively charged at low pH and negatively charged at high pH, although they had different PZCs .…”

Section: Proton-assisted Dna Adsorptionmentioning

confidence: 99%

“…Understanding the interaction between DNA and ITO (also with In 2 O 3 and SnO 2 ) is a key step in the fabrication of electric biosensors. 76 The three types of nanoparticles were all positively charged at low pH and negatively charged at high pH, although they had different PZCs. 77 With a certain ITO-to-DNA ratio, a low pH resulted in >95% DNA attachment, while <5% of DNA attached at pH 8.…”

Section: ■ Introductionmentioning

confidence: 99%

Promoting DNA Adsorption by Acids and Polyvalent Cations: Beyond Charge Screening

Kushalkar

Liu

2020

Langmuir

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Adsorbing DNA oligonucleotides onto nanoparticles is the first step in developing DNA-based biosensors, drug delivery systems, and smart materials. Since DNA is a polyanion, it is repelled by negatively charged nanoparticles, which constitute the majority of commonly used nanomaterials. Adding salt such as NaCl to screen charge repulsion is a standard method of promoting DNA adsorption. However, Na + does not supply additional attractive forces. In addition, adding a high concentration of NaCl can cause the aggregation of nanomaterials. In this feature article, we mainly summarize the methods developed in our laboratory to promote DNA adsorption by lowering the pH and by adding polyvalent metal ions, especially transition-metal ions. Various materials including noble metals (gold, silver, and platinum), 2D materials (graphene oxide, MoS 2 , WS 2 , and MXene), polydopamine, and several metal oxides are discussed. In general, low pH can protonate DNA bases and nanoparticle surfaces, reducing charge repulsion and even leading to attraction, although DNA folding at low pH can sometimes be detrimental to adsorption. Polyvalent metal ions can bridge additional interactions to achieve otherwise impossible adsorption. On the basis of the current understanding, a few future research directions are proposed to further improve DNA adsorption.

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“…At the top of solar cell is a transparent conducting oxide metal contact layer. This layer is composed of indium doped tin oxide (ITO) that offers better electrical transport properties such as higher transparency to sunlight for minimising electrical losses and high conductivity [27]. It also serves as an ohmic contact for lateral transport of charge carriers towards the electrodes.…”

Section: Solar Cell Structurementioning

confidence: 99%

Design and analysis of an ultra‐thin crystalline silicon heterostructure solar cell featuring SiGe absorber layer

Hussain¹,

Mehmood²,

Khizar

et al. 2018

IET Circuits, Devices & Systems

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Here, the authors studied a silicon-germanium (Si 1−x Ge x) absorber layer for the design and simulation of an ultra-thin crystalline silicon solar cell using Silvaco technology computer-aided design. Seeking ways to design and fabricate solar cells using 100 μm thicker silicon substrates is the subject of intense research efforts among the photovoltaic (PV) community. The aim is to further reduce the substrate thickness to 20 μm without compromising the efficiency of the solar cell. A thin layer of SiGe film with the Ge composition of 15% has been introduced in this work that assists in absorbing the longer wavelength of the sunlight spectrum. The effects of the doping concentration and absorber layer thickness on the conversion efficiency have been examined. The simulated results exhibited significant enhancement in the sunlight absorption as compared to the reference structure based on crystalline silicon. The highest efficiency of 16.8% with an overall solar cell thickness of ∼26 μm has been observed. The proposed heterostructure solar cell design will support the industrial development of an efficient, lowcost, shorter energy payback time, and lightweight PV technology for its widespread implementation.

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Study on the physical properties of indium tin oxide thin films deposited by microwave-assisted spray pyrolysis

Cited by 18 publications

References 31 publications

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

Promoting DNA Adsorption by Acids and Polyvalent Cations: Beyond Charge Screening

Design and analysis of an ultra‐thin crystalline silicon heterostructure solar cell featuring SiGe absorber layer

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