Gas Sensors

Disposable, paper-based, inkjet-printed humidity and H2S gas sensor for passive sensing applications

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Abdul Quddious, et al., " Disposable, paper-based, inkjet-printed humidity and H2S gas sensor for passive sensing applications" . Sensors, 16 (12), 2016, 2073. An inkjet-printed, fully passive sensor capable of either humidity or gas sensing is presented herein. The sensor is composed of an interdigitated electrode, a customized printable gas sensitive ink and a specialized dipole antenna for wireless sensing. The interdigitated electrode printed on a paper substrate provides the base conductivity that varies during the sensing process. Aided by the porous nature of the substrate, a change in

H2S Sensors: Fumarate‐Based fcu‐MOF Thin Film Grown on a Capacitive Interdigitated Electrode

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Omar Yassine, et al., " H2S Sensors: Fumarate‐Based fcu‐MOF Thin Film Grown on a Capacitive Interdigitated Electrode". Angewandte Chemie International Edition, 55 (51), 2016, 15879. Herein we report the fabrication of an advanced sensor for the detection of hydrogen sulfide (H2S) at room temperature, using thin films of rare‐earth metal (RE)‐based metal–organic framework (MOF) with underlying fcu topology. This unique MOF‐based sensor is made via the in situ growth of fumarate‐based fcu‐MOF (fum‐fcu‐MOF) thin film on a capacitive interdigitated electrode. The sensor showed a remarkable

MOFs for the sensitive detection of ammonia: Deployment of fcu-MOF thin films as effective chemical capacitive sensors

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Ayalew H. Assen, et al., " MOFs for the sensitive detection of ammonia: Deployment of fcu-MOF thin films as effective chemical capacitive sensors". ACS sensors, 2(9), 2017, 1294. This work reports on the fabrication and deployment of a select metal–organic framework (MOF) thin film as an advanced chemical capacitive sensor for the sensing/detection of ammonia (NH3) at room temperature. Namely, the MOF thin film sensing layer consists of a rare-earth (RE) MOF (RE-fcu-MOF) deposited on a capacitive interdigitated electrode (IDE). Purposely, the chemically stable naphthalene-based RE-fcu-MOF (NDC

Trianglamine-based supramolecular organic framework with permanent intrinsic porosity and tunable selectivity

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Arnaud Chaix, et al., "Trianglamine-based supramolecular organic framework with permanent intrinsic porosity and tunable selectivity", Journal of the American Chemical Society 140 (44), 2018, 14571. Here we introduce for the first time a metal-free trianglamine-based supramolecular organic framework, T-SOF-1, with permanent intrinsic porosity and high affinity to CO2. The capability of tuning the pore aperture dimensions is also demonstrated by molecular guest encapsulation to afford excellent CO2/CH4 separation for natural gas upgrading.

Highly sensitive and selective SO2 MOF sensor: the integration of MFM-300 MOF as a sensitive layer on a capacitive interdigitated electrode

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Valeriya Chernikova, et al., "Highly sensitive and selective SO2 MOF sensor: the integration of MFM-300 MOF as a sensitive layer on a capacitive interdigitated electrode." Journal of Materials Chemistry A 6(14), 2018, 5550. We report on the fabrication of an advanced chemical capacitive sensor for the detection of sulfur dioxide (SO2) at room temperature. The sensing layer based on an indium metal–organic framework (MOF), namely MFM-300, is coated solvothermally on a functionalized capacitive interdigitated electrode. The fabricated sensor exhibits significant detection sensitivity to SO2 at

The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study

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Karumbaiah N. Chappanda, et al., "The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study". Sensors and Actuators B: Chemical, 257, 2018, 609. The application of metal-organic frameworks (MOFs) as a sensing layer has been attracting great interest over the last decade, due to their uniform properties in terms of high porosity and tunability, which provides a large surface area and/or centers for trapping/binding a targeted analyte. Here we report the fabrication of a highly sensitive humidity sensor that is based on composite thin films

Concurrent Sensing of CO2 and H2O from Air Using Ultramicroporous Fluorinated Metal–Organic Frameworks: Effect of Transduction Mechanism on the Sensing Performance

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Mohamed Rachid Tchalala, et al., "Concurrent Sensing of CO2 and H2O from Air Using Ultramicroporous Fluorinated Metal–Organic Frameworks: Effect of Transduction Mechanism on the Sensing Performance." ACS Applied Materials & Interfaces 11 (1), 2019, 1706. Abstract: Conventional materials for gas/vapor sensing are limited to a single probe detection ability for specific analytes. However, materials capable of concurrent detection of two different probes in their respective harmful levels and using two types of sensing modes have yet to be explored. In particular, the concurrent detection of

Trianglamine Hydrochloride Crystals for a Highly Sensitive and Selective Humidity Sensor

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Karumbaiah N. Chappanda, et al., "Trianglamine Hydrochloride Crystals for a Highly Sensitive and Selective Humidity Sensor", Sensors and Actuators B: Chemical 294, 2019, 40. In this work, we present a highly sensitive and selective capacitive humidity sensor. Trianglamine hydrochloride is used as the sensing material, which is synthesized by a cyclocondensation reaction between terpthaldehyde and 1R,2R-cyclohexanediamine followed by addition of hydrochloric acid and vapor diffusion of acetone. The crystalline trianglamine hydrochloride salts are dispersed in acetonitrile and then coated

Fluorinated MOF Platform for Selective Removal and Sensing of SO 2 from Flue Gas and Air

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Mohamad Tchalala, et al., " Fluorinated MOF Platform for Selective Removal and Sensing of SO 2 from Flue Gas and Air", Nature communications, 10(1), 2019, 1. Conventional SO2 scrubbing agents, namely calcium oxide and zeolites, are often used to remove SO2 using a strong or irreversible adsorption-based process. However, adsorbents capable of sensing and selectively capturing this toxic molecule in a reversible manner, with in-depth understanding of structure–property relationships, have been rarely explored. Here we report the selective removal and sensing of SO2 using recently unveiled

Molybdenum trioxide (MoO3) Capacitive Soil Moisture Microsensor for In-situ Agriculture Applications: Measurement Studies and Temperature Effects

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Sandeep Surya, et al., " Molybdenum Trioxide (MoO3) Capacitive Soil Moisture Microsensor for In-situ Agriculture Applications: Measurement Studies and Temperature Effects". The soil moisture sensor is of utmost importance in agriculture due to issues including water conservation and disease prediction. This work presents the design and development of a molybdenum trioxide (MoO3) based capacitive soil moisture microsensor. The sensor comprises an inter-digitated electrode (IDE) on a silicon wafer and MoO3 is drop cast on IDE, which acts as the sensing film. IDE on Si wafer is mounted on the

Methanol and Humidity Capacitive Sensors Based on Thin Films of MOF Nanoparticles

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Miguel Andrés, et al., "Methanol and Humidity Capacitive Sensors Based on Thin Films of MOF Nanoparticles." ACS Applied Materials & Interfaces 12 (3) ,2020, 4155. The successful development of modern gas sensing technologies requires high sensitivity and selectivity coupled to cost effectiveness, which implies the necessity to miniaturize devices while reducing the amount of sensing material. The appealing alternative of integrating nanoparticles of a porous metal–organic framework (MOF) onto capacitive sensors based on interdigitated electrode (IDE) chips is presented. We report the

Organic field effect transistors (OFETs) in environmental sensing and health monitoring: A review

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Sandeep G. Surya, et al., "Organic Field Effect Transistors (OFETs) in Environmental Sensing and Health Monitoring: A review, Trends in Analytical Chemistry 111, 2019, 27. Abstract: Organic field effect transistors (OFETs) have been the focus of sensing application research during the last two decades. In comparison to their inorganic counterparts, OFETs have multiple advantages such as low-cost manufacturing, large area coverage, flexibility, and readily tunable electronic material properties. To date, various organic semiconductors (OSCs), both polymers and small molecules, have been

Fully Integrated Indium Gallium Zinc Oxide NO2 Gas Detector

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Mani Teja Vijjapu, et al.,"Fully Integrated Indium Gallium Zinc Oxide NO2 Gas Detector." ACS Sensors 5 (4), 2020, 984. We report an amorphous indium gallium zinc oxide (IGZO)-based toxic gas detection system. The microsystem contains an IGZO thin-film transistor (TFT) as a sensing element and exhibits remarkable selectivity and sensitivity to low concentrations of nitrogen dioxide (NO 2). In contrast to existing metal oxide-based gas sensors, which are active either at high temperature or with light activation, the developed IGZO TFT sensor is operable at room temperature and requires only

Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF

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Saravanan Yuvaraja, et al., "Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF." ACS Applied Materials & Interfaces 12 (16), 2020, 18748. Organic field-effect transistors (OFETs) are emerging as competitive candidates for gas sensing applications due to the ease of their fabrication process combined with the ability to readily fine-tune the properties of organic semiconductors. Nevertheless, some key challenges remain to be addressed, such as material degradation, low sensitivity, and poor selectivity toward

Fully Integrated Organic Field‐Effect Transistor Platform to Detect and to Quantify NO2 Gas

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Saravanan Yuvaraja, et al.,"Fully Integrated Organic Field‐Effect Transistor Platform to Detect and to Quantify NO2 Gas." physica status solidi (RRL)–Rapid Research Letters, 2020, 2000086. Herein, the gas sensing characteristics of PDVT‐10 organic field‐effect transistor (OFET) devices are explored and integrated to build a compact analog‐to‐digital converter (ADC) gas detection system. The electrical characteristics of the pristine PDVT‐10 OFET exhibit I on/I off ratio and threshold voltage as 104 and −12 V, respectively. Through the coating of a metal‐organic framework (MOF) on the surface

A Highly Selective Metal-Organic Framework Textile Humidity Sensor

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Sakandar Rauf, et al., "A Highly Selective Metal-Organic Framework Textile Humidity Sensor" ACS Applied Materials & Interfaces, 2020. The increase in demand and popularity of smart textiles brings new and innovative ideas to develop a diverse range of textile-based devices for our daily life applications. Smart textile-based sensors (TEX sensors) become attractive due to the potential to replace current solid-state sensor devices with flexible and wearable devices. We have developed a smart textile sensor for humidity detection using a metal-organic framework (MOF) as an active thin-film layer

An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture

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Sandeep Surya, et al., "An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture" Sensors and Actuators B: Chemical 2020, 128542. The development of in-situ soil moisture sensors (SMS) with advanced materials is the requirement of the future autonomous agriculture industry. However, an open challenge for these sensors is to control changes in the capacitance rather than resistance while attaining reliability, high performance, scalability and stability. In this work, a series of materials such as Graphite oxide (GO), Molybdenum disulfide (MoS2), Vanadium

Semitransparent graphite films growth on Ni and their double-sided polymer-free transfer

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G. Deokar, et al.,“Semitransparent graphite films growth on Ni and their double-sided polymer-free transfer”, accepted, Nature Scientific reports, 2020 Nanorange thickness graphite films (NGFs) are robust nanomaterials that can be produced via catalytic chemical vapour deposition but questions remain regarding their facile transfer and how surface topography may affect their application in next-generation devices. Here, we report the growth of NGFs (with an area of 55 cm 2 and thickness of ~ 100 nm) on both sides of a polycrystalline Ni foil and their polymer-free transfer (front- and back

A multi-bit fully integrated thin-film transistor NO2 gas detector at room temperature

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Mani Teja, et al., “A multi-bit fully integrated thin-film transistor NO2 gas detector at room temperature”, IEEE sensor letters 4 (8), 2020, 5501204. Inexpensive and compact gas sensing systems are indispensable for accurate air quality monitoring with broad spatial coverage. We report an InGaZnO thin-film transistor (TFT)-based integrated NO 2 gas detection system that yields a digital output proportional to the NO 2 concentration. This is the first report on integrated TFT-based detectors where gas concentration is quantified and where simultaneous digital output is provided without

Anti-poisoning electrode for real-time in-situ monitoring of hydrogen sulfide release

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Nithiya Jeromiyas, et al., " Anti-poisoning electrode for real-time in-situ monitoring of hydrogen sulfide release" Sensor and Actuators B: Chemistry 7 (10), 2020, 128844. Electrode poisoning and interferences from complex biological environments are major challenges in the development of in-situ H 2S sensors. To circumvent these issues, herein a robust electrode based on reduced graphene oxide-molybdenum disulfide nanohybrid (RGO-MoS 2) and polymerized o-phenylenediamine (POPD) is developed. The POPD/RGO-MoS 2-modified electrode catalyzed H 2S oxidation at a minimized overpotential (+ 0.15 V

A highly selective electron affinity facilitated H2S sensor: the marriage of tris(keto-hydrazone) and organic field-effect transistor

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Saravanan, Yuvaraja, et al. "A highly selective electron affinity facilitated H2S sensor: the marriage of tris (keto-hydrazone) and organic field-effect transistor." Materials Horizons, 2020. Conjugated polymers (CPs) are emerging as part of a promising future for gas-sensing applications. However, some of their limitations, such as poor specificity, humidity sensitivity and poor ambient stability, remain persistent. Herein, a novel combination of polymer-monomer heterostructure, derived from CP (PDVT-10) and a newly accomplished monomer has been integrated in an organic

Sandeep Surya

Postdoctoral Research Fellow, Sensors
Dr. Sandeep Surya is currently a Post-Doctoral fellow at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Dr. Sandeep G. Surya received his Ph.D. degree from IIT Bombay in 2017. He is currently a Post-Doctoral Fellow with Sensors Lab, CEMSE Division, King Abdullah University of Science and Technology. Prior to this, he was a Research Associate with the Microsystems Technology Research Unit, Fondazione Bruno Kessler, Trento, Italy. His forte is in building platforms for different sensor

Sanjit Majhi

Postdoctoral Research Fellow, Sensors
Sanjit Manohar Majhi has recently joined the Sensors group, as a Postdoctoral fellow. Dr. Majhi currently focused on the synthesis of nanomaterials based on 1D/2D metal oxides for gas and biosensing applications. Education and early career Sanjit Manohar Majhi received his Ph.D. degree from the department of Electronic Information Materials Engineering in Chonbuk National University, South Korea in August 2017. He received his master degree in Chemistry from Utkal University, Bhubaneswar in India in 2008. He joined recently in King Abdullah University of Science and Technology, to work under

Mani Teja Vijjapu

Mani Teja did his bachelors in Electronics and communications from Jawaharlal Technological University Anantapur, India in the year 2013. He worked as a research associate for Physical Research Laboratory, India for couple of years. He further continued to work as a research associate at IIT Madras, India. Later he pursued his masters in Solid state electronic devices from National Chiao-Tung University (NCTU), Taiwan and graduated in 2018. His Master’s thesis is focused on fabricating a binary synapse like memristor using atomic layer deposition. He did his summer internship at National