Mani Teja Vijjapu

• Doctor of Philosophy
• Scientist at SAL Silicon Austria Labs

Strain gauges are essential in various industrial applications. Commercial strain gauges are developed using Constantan and Karma alloys due to their low temperature sensitivity. Creating alloy inks for printing poses challenges due to high sintering temperatures. Consequently, printed strain gauges (PSGs) are typically made using inks based on sil...

This article introduces a methodology to increase the integration density of functional electronic features on fibers/threads/wires through additive deposition of functional materials via printed electronics. It opens the possibility to create a multifunctional intelligent system on a single fiber/thread/wire while combining the advantages of exist...

The detection of volatile organic compounds (VOCs) such as acetone is critical in clinical diagnostics and environmental monitoring. Acetone is a key biomarker for several medical conditions, most notably diabetes, and widely used as an industrial solvent, present in many household products, which can lead to environmental exposure. In this study,...

The rise of single-use electronics for fast health screening has prompted a reevaluation of traditional materials and manufacturing techniques to address the growing issue of electronic waste (e-waste). Inexpensive self-monitoring devices provide valuable insights into the body's essential metabolic functions. They can measure outrange values in ke...

There is a need for reliable and accurate air quality monitoring systems in order to secure human health from the air pollutants such as nitrogen dioxide (NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ). The development of low-cost and modern technology-compatible sensing systems is essent...

Pressure sensors are among the most widely used devices to collect quantitative feedback during physical interactions of mechanical systems, especially in robotics. In this work, we demonstrate flexible interdigitated capacitive pressure sensors using polydimethylsiloxane (PDMS) as pressure sensitive layer. Furthermore, we investigate the possibili...

High sensitivity is one of the desirable characteristics for a tactile pressure sensor, especially in soft robotics and biomedical applications, e.g., prothesis and smart orthosis. We perform a detailed Finite Element Method analysis of a novel tactile sensor. It is comprised of interdigitated electrodes coated with a composite made of Polydimethyl...

The use of porous materials as the core for synthesizing molecularly imprinted polymers (MIPs) adds significant value to the resulting sensing system. This review covers in detail the current progress and achievements regarding the synergistic combination of MIPs and porous materials, namely metal/covalent–organic frameworks (MOFs/COFs), including...

Acute myocardial infarction (AMI), commonly known as a heart attack, is a life-threatening condition that causes millions of deaths every year. In this study, a transistor-based biosensor is developed for rapid and sensitive detection of cardiac troponin-I (cTnI), a diagnostic biomarker of AMI. A biosensing technique based on a field effect transis...

Early diagnosis of cardiovascular diseases (CVDs) has the potential to save millions of lives each year. Sensitive quantitative measurement of blood cardiac troponin I (cTnI) is required for early diagnosis of CVDs. Porous graphitic carbon nitride (PCN) nanomaterials integrated biosensor that detects picogram/mL concentrations of cTnI is reported....

Emerging nonvolatile memory technologies are promising due to their anticipated capacity benefits, nonvolatility, and zero idle energy. One of the most promising candidates is resistive random access memory (RRAM) based on resistive switching (RS). This paper reviews the development of RS device technology including the fundamental physics, materia...

Neuromorphic vision sensors have been extremely beneficial in developing energy-efficient intelligent systems for robotics and privacy-preserving security applications. There is a dire need for devices to mimic the retina’s photoreceptors that encode the light illumination into a sequence of spikes to develop such sensors. Herein, we develop a hybr...

Here a novel tris(keto‐hydrazone) monomer having secondary amines and alkoxy groups to detect toxic hydrogen sulfide (H2S) gas is reported. The as‐synthesized tris(keto‐hydrazone) monomer is successfully integrated on a micro‐fabricated device to realize an organic capacitive sensor. The organic sensor's quantitative detection capability toward H2S...

We have faced the challenges from atmosphere environment due to the exposing toxic gases or liquids. Moreover, we also need to test some gases such as acetone, ethanol, and petroleum for our health or safety. Therefore, it is important to develop various gas sensors for testing them. Sensing materials play important roles in determining the perform...

Resistive strain and bending sensors offer a versatile platform for sensing various physical parameters with relatively little effort and budget. The lightweight, robust and compact sensors are extensively used in manifold low-power applications. Recently, scribed and flexible laser-induced graphene sensors have shown potent capabilities for a vari...

Semiconducting metal oxide gas sensors that are inexpensive, room temperature operable are imperative for toxic gas and air pollution monitoring. The heating or continuous light activation requirements are unavoidable for these types of gas sensors. This paper reports for the first time a room temperature operable solution-processed In-Ga-Zn-O thin...

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 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> gas detection system that yields a digital output pr...

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 develo...

To date, organic semiconductor (OSC) materials have been used in transistor devices for several sensor applications. Saravanan Yuvaraja et al. (article number 2000086) explored the use of Diketopyrrolopyrrole (DPP) based OSCs and metal‐organic frameworks (MOFs) in heterostructure configuration to realize an organic field‐effect transistor (OFET) th...

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 Ion/Ioff ratio and threshold voltage as 10⁴ and −12 V, respectively. Through the...

has been withdrawn at the request of the authors.

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, an...

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 (NO2). In contrast to existing metal oxide-based gas sensors, which are active either...

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 sens...

Hydrogen sulfide (H2S) is a highly poisonous gas that, when in a work place, must be identified immediately at concentrations greater than 10 ppm. Although there are numerous reports on sensing H2S gas using various techniques and approaches, there still exist a gap in terms of limit of detection (LOD) and feasibility. In this work, we demonstrate...

Emerging non-volatile memory technologies are promising due to their anticipated capacity benefits, non-volatility, and zero idle energy. One of the most promising candidates is resistive random access memory (RRAM) based on resistive switching (RS). This paper reviews the development of RS device technology including the fundamental physics, mater...

A CMOS compatible Ni/HfO2/Al2O3/TiN bipolar filamentary ReRAM grown by atomic layer deposition (ALD) showing uniform switching and excellent memory window is fabricated. The significance of Al2O3 in bilayer device is investigated, it is shown that insertion of thin ALD grown Al2O3 film improves uniformity and endurance of the device. The demonstrat...