Article
Chemistry, Physical
Ahmet Emre Kasapoglu, Saman Habashyani, Ali Baltakesmez, Demet Iskenderoglu, Emre Gur
Summary: This study successfully grew Sb-doped ZnO nanorods using a simple spray pyrolysis method, with XRD measurements indicating preferential c-axis (002) plane for all films, and no lattice distortion from Sb doping. Raman measurements showed Sb doping related modes, especially defect related, in ZnO nanorods, with excellent hydrogen gas sensor performance demonstrated by a 5.0 wt% Sb-doped ZnO nanorod sample.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Analytical
K. Khamfoo, A. Staerz, M. Boepple, A. Wisitsoraat, C. Liewhiran, U. Weimar, N. Barsan
Summary: Zinc stannate nanoparticles were synthesized using flame spray pyrolysis and their properties were characterized. The study found that zinc stannate showed distinct sensing behavior compared to its parent oxides. Diffuse reflectance infrared Fourier transform spectroscopy provided insights into the surface reactions responsible for the sensing behavior of the flame-spray-made Zn2SnO4 based sensor.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Electrical & Electronic
E. A. Villegas, L. A. Ramajo, M. E. Lere, M. S. Castro, R. Parra
Summary: Pure and aluminum doped-zinc oxide thin films were grown by spray-pyrolysis method on glass substrates. The addition of Al led to changes in microstructure and grain morphology of the films. Electrical response to UV light was more intense in undoped films, with longer recovery time after interrupting illumination.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Analytical
K. Inyawilert, A. Sukee, M. Siriwalai, A. Wisitsoraat, J. Sukunta, A. Tuantranont, S. Phanichphant, C. Liewhiran
Summary: Erbium-doped SnO2 nanoparticles with different Er concentrations were synthesized and their gas-sensing properties were investigated. The sample with 0.1 wt% Er exhibited the best response to C2H4O, showing significantly improved performance compared to the undoped sample.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
J. R. Ramos-Serrano, S. Alcantara-Iniesta, M. Acosta-Osorno, Ma Estela Calixto
Summary: This work explores the piezoelectric response of ZnO thin films deposited by ultrasonic spray pyrolysis with a preferential orientation at the c-axis. The results show that higher temperatures lead to improved crystalline film quality and grain size. The angular distribution of the crystals on the substrate plane deviates slightly from the normal at higher temperatures. Moreover, a prototype based on ZnO thin films was fabricated to measure the piezoelectric response, and samples with better crystallinity and high resistivity exhibit the most intense measured piezoelectric voltage.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Analytical
K. Khamfoo, A. Wisitsoraat, M. Punginsang, A. Tuantranont, C. Liewhiran
Summary: Nb-doped SnO2 nanoparticles were synthesized via flame spray pyrolysis for the first time, with 0.5 wt% Nb content providing the best sensor response to 1 vol% C2H2 at 350 degrees Celsius. The sensor also exhibited low humidity dependence, good long-term stability, and high C2H2 selectivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Materials Science, Ceramics
Zhidan Song, Long Zhang, Quan Zhou, Ziang Zhang, Zhaobo Dong, Lifan Nie, Qingyi Liu, Gebo Pan
Summary: To ensure safety in using hydrogen energy, highly sensitive hydrogen sensors are needed for early detection of hydrogen leaks. In this study, a low-cost process was used to fabricate PdO-decorated NiO hydrogen sensors capable of detecting sub-ppm H2 concentration. The results show that PdO doping significantly enhances the gas response to H2.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Gouranga Maharana, Reddivari Muniramaiah, J. Yuvashree, Diptendu Mandal, Supravat Mondal, M. Kovendhan, Jean Maria Fernandes, Gangalakurti Laxminarayana, D. Paul Joseph
Summary: This research utilized a co-doping strategy to modify the optoelectronic parameters of SnO2 thin films, and confirmed the success of doping and its effects through various analysis techniques.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Jinbaek Bae, Arqum Ali, Jin Jang
Summary: Spray-pyrolyzed amorphous indium-gallium-zinc oxide (a-IGZO) thin-film transistor (TFT) with self-aligned (SA) coplanar structure exhibits excellent performance and stability, making it a promising metal oxide semiconductor for high-performance TFT backplanes.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Review
Chemistry, Analytical
Srinivasa Rao Sriram, Saidi Reddy Parne, Nagaraju Pothukanuri, Damodar Reddy Edla
Summary: Nanostructured materials play an important role in various applications, and spray pyrolysis is a simple, low-cost, and efficient method for their synthesis. This review discusses the principles, techniques, and recent advancements in spray pyrolysis for the deposition of nanostructures.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Materials Science, Multidisciplinary
Basavaraj G. Hunashimarad, J. S. Bhat, P. Raghavendra, R. F. Bhajantri
Summary: The photoresponse of calcium-doped zinc oxide (ZnO:Ca) metal-semiconductor-metal (MSM) UV detectors is investigated. The ZnO:Ca films exhibit high transparency in the visible region and have polycrystalline, hexagonal wurtzite structure with preferred growth along the c-axis. The redshift in the optical band gap is attributed to increased crystallite size, resulting in improved n-type conductivity and higher responsivity for the fabricated MSM photodetector. Transient response measurements show fast switching behavior. These findings suggest that ZnO:Ca can be a promising active material for UV photodetectors.
Article
Nanoscience & Nanotechnology
Mehdi Akbari-Saatlu, Marcin Procek, Claes Mattsson, Goran Thungstrom, Tobias Torndahl, Ben Li, Jiale Su, Wenjuan Xiong, Henry H. Radamson
Summary: Designing heterostructure materials at the nanoscale is a well-known method to enhance gas sensing performance. In this study, ZnO/SnO2 heterostructures were grown on alumina substrates using the ultrasonic spray pyrolysis method. The results showed that the sensitivity of the sensor to H2S gas can be altered by changing the zinc chloride content in the precursor, and the heterostructures with a 5:1 ratio of ZnCl2 to SnCl2·2H(2)O exhibited the highest response. The gas sensing mechanism of the ZnO/SnO2 heterostructures was analyzed and attributed to the formation of the heterostructure between ZnO and SnO2.
ACS APPLIED NANO MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
T. V. K. Karthik, A. Maldonado, M. de la L. Olvera, A. G. Hernandez, J. Vega-Perez, H. Gomez-Pozos
Summary: Copper-doped zinc oxide (ZnO:Cu) thin films were deposited on glass substrates using ultrasonic spray pyrolysis technique, and the effect of water content on methylene blue (MB) dye degradation through a photocatalytic process was studied. Different films exhibited varying degradation behaviors, with the photocatalytic response related to the surface morphology. Films deposited with 80% water content showed more promising MB degradation for UV exposure times longer than 180 min.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Engineering, Environmental
Jian Fang, Jing-Jing Xue, Rong-Pu Xiao, Xi Chen, You-Min Guo, Ji-Ming Song
Summary: This study reported a gas sensor based on Pr-doped ZnO nanospindles for the detection of triethylamine (TEA). Among the different doping concentrations, the 2 mmol% Pr-ZnO sensor exhibited the highest response value towards TEA gas. The sensor showed good reproducibility, rapid response/recovery time, theoretical limit of detection, outstanding long-term stability, and excellent selectivity for TEA gas.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Malika Allali, Mohamed Amine Dahamni, Mostefa Ghamnia, Abdelwahab Boukhachem, Djamel Boukredimi, Didier Tonneau, Carole Fauquet
Summary: Pure and Cu-doped NiO films were synthesized and characterized. Cu-doping improved the structure, morphology, and photocatalytic properties of NiO films.
Article
Engineering, Environmental
Junma Tang, Priyank Kumar, Zhenbang Cao, Jialuo Han, Torben Daeneke, Dorna Esrafilzadeh, Anthony P. O'Mullane, Jianbo Tang, Arifur Rahim, Kourosh Kalantar-Zadeh
Summary: By using mechanical energy as the stimulus and liquid metal gallium (Ga) together with nickel (Ni) particles as co-catalysts, renewable biofuels can be converted into mainly H-2 and C2H4 at near room temperature. This approach offers an alternative for H-2 and C2H4 production without high reaction temperatures and fossil fuel hydrocarbons.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
David A. A. Katzmarek, Yang Yang, Mohammad B. B. Ghasemian, Kourosh Kalantar-Zadeh, Richard W. W. Ziolkowski, Francesca Iacopi
Summary: The properties of epitaxial graphene for radio frequency (RF) applications are investigated. Metal coplanar waveguides (CPWs) are fabricated to evaluate the frequency-dependent behavior of the graphene's sheet resistance. The quality of the metal contact with graphene and the influence of small-scale discontinuities are important factors in the RF spectrum.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ruohan Yu, Jialuo Han, Yuan Chi, Jiewei Zheng, Richard Fuchs, Mohammad B. Ghasemian, Md. Arifur Rahim, Shi-Yang Tang, Guangzhao Mao, Kourosh Kalantar-Zadeh, Jianbo Tang
Summary: Exploring the influence of minor constituents on liquid alloys, this study shows that the presence of solute metals in liquid gallium can significantly affect their electrocapillarity and electrochemistry. The formation of different fractal modes in liquid alloy droplets under controlled voltage and alkaline solution conditions is investigated, with distinct non-branched droplets, unstable fractals, and stable fractals observed. Surface tension measurements, cycle voltammetry, and surface compositional characterizations provide evidence that minor alloy components drastically alter the surface tension, electrochemical oxidation, and oxide dissolution processes. These findings offer promising opportunities for harnessing the tunability and functionality of liquid metals.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiewei Zheng, Astha Sharma, Tushar Kumeria, Yuan Chi, Mohammad B. B. Ghasemian, Guangzhao Mao, Jianbo Tang, Priyank Kumar, Md. Arifur Rahim, Kourosh Kalantar-Zadeh
Summary: Liquid metals provide new dimensions for controlling and governing reactions. Solutes in liquid metals can be used to enhance and tune interfacial reactions. In this study, zinc (Zn) is shown to enrich the interfacial area for the synthesis of highly crystalline and porous ZIF-8. The highest reaction rate and best quality ZIF-8 are achieved when a eutectic liquid metal system of Zn with gallium (Ga) is implemented.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Zhenbang Cao, Yuan Chi, Junma Tang, Dorna Esrafilzadeh, Jianbo Tang, Md. Arifur Rahim, Donald S. Thomas, Mohammad Tajik, William A. Donald, Kourosh Kalantar-Zadeh
Summary: In this study, a gallium-ethylene glycol system was used to break down organic bonds and produce hydrogen gas. By applying mechanical agitation, an in-situ monitoring approach was established to analyze the gaseous products and the post-reaction mixture. The results showed that gallium could continuously and selectively produce hydrogen gas and also generate alkanes and alkenes. This study provides a platform to explore alternative strategies for hydrogen production and organic transformation using liquid metals.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Thilini Thathsara, Jaydon Meilak, Mohammad Sangchap, Christopher Harrison, Rosalie Hocking, Mahnaz Shafiei
Summary: This study proposes a sensitized composite of titanium dioxide nanoparticles enclosed in reduced graphene oxide nanosheets for hydrogen gas sensing under low voltage and low temperature conditions. By suppressing electron-hole recombination and creating heterojunctions, the sensing performance is enhanced. The fabricated material exhibits high response, selectivity, stability, environmental friendliness, and energy efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Damon M. de Clercq, Jiong Yang, Muhammad Hanif, Jessica Alves, Jiale Feng, Michael P. Nielsen, Kourosh Kalantar-Zadeh, Timothy W. Schmidt
Summary: Hybrid inorganic-organic semiconducting devices based on monolayer transition metal dichalcogenides (TMDs) have high radiative efficiencies and can form flexible P-N junctions, but the understanding of excitons and charges at the interface between TMDs and organic systems is still limited.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Mohamed Kilani, Mostak Ahmed, Mohannad Mayyas, Yifang Wang, Kourosh Kalantar-Zadeh, Guangzhao Mao
Summary: The lack of understanding for precise synthesis and assembly of nano-entities remains a major challenge for nanofabrication. Electrocrystallization of a charge-transfer complex (CTC), tetrathiafulvalene bromide (TTF)Br, is studied on micro/nanoelectrodes for precision deposition of functional materials. This study, for the first time, establishes CTC nanoelectrochemistry as a platform technology for precise deposition of conductive crystal assemblies spanning the source and drain electrode for sensing applications.
Article
Nanoscience & Nanotechnology
Maedehsadat Mousavi, Mohammad B. Ghasemian, Mahroo Baharfar, Mohammad Tajik, Yuan Chi, Guangzhao Mao, Kourosh Kalantar-Zadeh, Jianbo Tang
Summary: Liquid metal-electrolyte can be used for self-deposition of low-dimensional nanomaterials. The liquid metal-driven interfacial growth of metal tellurides was explored using eutectic gallium-indium (EGaIn) as the liquid metal and specific cation pairs as precursors. The deposited materials consisted of metal telluride and tellurium, and their properties depended on the metal ion type and the metal-to-tellurium ion ratios. The synthesized materials showed promising potential as electrode modifiers, increasing the electroactive surface area of unmodified electrodes and demonstrating remarkable activity for electrochemical reactions.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Vi Khanh Truong, Andrew Hayles, Richard Bright, Trong Quan Luu, Michael D. Dickey, Kourosh Kalantar-Zadeh, Krasimir Vasilev
Summary: The proliferation of drug resistance in microbial pathogens poses a significant threat to human health. Liquid metal nanoparticles, particularly gallium-based ones, show promise in combating this problem due to their distinctive properties, high antimicrobial efficacy, and low toxicity. The unique bactericidal mechanism of gallium liquid metal can bypass emerging drug resistance mechanisms, making it a valuable strategic pathway in the battle against antimicrobial resistance.
Article
Chemistry, Analytical
Ali Yavari, Irfan Baig Mirza, Hamid Bagha, Harindu Korala, Hussein Dia, Paul Scifleet, Jason Sargent, Caroline Tjung, Mahnaz Shafiei
Summary: Greenhouse gas emissions reporting and sustainability are crucial for businesses, but the lack of a standardized method and understanding of emissions in complex logistics activities hinder businesses from fully grasping their emissions footprint. This paper presents a reliable and accurate sensing technique for real-time GHG emissions monitoring, utilizing IoT and AI to reduce reliance on gas sensors.
Article
Chemistry, Analytical
Thilini Thathsara, Christopher J. Harrison, Rosalie K. Hocking, Mahnaz Shafiei
Summary: Hydrogen, as a promising sustainable and clean energy source, is of great importance. By utilizing light, sensors have been fabricated that can detect the presence of hydrogen gas at room temperature, reducing working temperature and enhancing sensing performance.
Article
Materials Science, Multidisciplinary
Moonika Sari Widjajana, Shih-Hao Chiu, Yuan Chi, Mahroo Baharfar, Jiewei Zheng, Mohammad B. Ghasemian, Saroj Kumar Bhattacharyya, Jianbo Tang, Md. Arifur Rahim, Kourosh Kalantar-Zadeh
Summary: To optimize the performance of thermoelectric materials, liquid metal-based processes are used to engineer their characteristics. In this study, indium (In) was introduced into bismuth (Bi) using a liquid metal-based process to investigate the thermoelectric properties. The sample with 2% indium concentration showed the highest Seebeck coefficient and electrical resistivity. The thermal conductivity decreased with increasing indium concentration up to 5%, and then showed a reverse trend. With a 5% indium concentration, the Bi-In system exhibited the highest figure of merit (zT) value, nearly twice that of pristine bismuth, due to the crystal modalities and diffraction peaks formed in the pool of bismuth. This study demonstrates a feasible and cost-effective approach for designing thermoelectric materials through liquid metal-enabled processes.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Mohammad B. Ghasemian, Yifang Wang, Francois-Marie Allioux, Ali Zavabeti, Kourosh Kalantar-Zadeh
Summary: Liquid metal (LM) droplets are being used in various applications such as catalysis, sensing, and flexible electronics. To modulate the electronic properties of LM, a method for on-demand alternating electronic properties is necessary. In this study, n-type MoOx and MoOxSy semiconductors were deposited on the surface of EGaIn LM droplets under mechanical agitation, resulting in the formation of oxide and oxysulfide layers. The comprehensive study of electronic and optical properties revealed a decrease in band gap, leading to deeper n-type doping of the materials.
Article
Automation & Control Systems
Shih-Hao Chiu, Mahroo Baharfar, Yuan Chi, Moonika Sari Widjajana, Zhenbang Cao, Francois-Marie Allioux, Jianbo Tang, Md. Arifur Rahim, Kourosh Kalantar-Zadeh
Summary: Thiol molecules are used to functionalize the surface of gallium particles, reducing oxidation and providing electrical conductivity. These modified particles are then used to develop soft devices for gas, exhalation, and flex sensing. This study explores the possibility of creating conductive mixes using organic molecules and liquid metal-based nano-/microparticles, and the potential for fabricating multifunctional sensors.
ADVANCED INTELLIGENT SYSTEMS
(2023)
