Sherjeel M. Khan

• PhD
• PhD at King Abdullah University of Science and Technology

Capacitive pressure sensors have several advantages in areas such as robotics, automation, aerospace, biomedical and consumer electronics. We present mathematical modelling, finite element analysis (FEA), fabrication and experimental characterization of ultra-low cost and paper-based, touch-mode, flexible capacitive pressure sensor element using Do...

Soft and flexible capacitive tactile sensors are animportant tool to; accurately measure tactile forces in wearablehealth monitors and enable soft grasping in robots. Precise forcemeasurements in real-time pave the way for enhanced human-machine interaction, improved automation safety, and novelmedical diagnostics approaches. In this work, a parall...

Uncertainties in grasp prediction for unknown, arbitrarily shaped objects in cluttered environments and un- certainty of the kinematics (e.g., series elastic robots or soft robots) can lead to poor grasps. For delicate objects, such poor grasps may damage the objects when they are dropped or when high local pressure is introduced in the grasping pr...

Hybrid integration of electronics in flexible substrates using Fan out wafer-level packaging (FOWLP) has recently gained significant attention with numerous applications in wearable electronics, foldable displays, robotics, medical implants, and healthcare monitoring. In this study, a fully additive and scalable manufacturing process flow to realiz...

Uncertainties in grasp prediction for unknown, arbitrarily shaped objects in cluttered environments and uncertainty of the kinematics (e.g., series elastic robots or soft robots) can lead to poor grasps. For delicate objects, such poor grasps may damage the objects when they are dropped or when high local pressure is introduced in the grasping proc...

Multifunctional Biface Sensor Tag In article number 2200027, Lukas Rauter and co‐workers show that the fastest‐growing waste stream in the world is electronic waste. The number of sensors deployed increases rapidly, which raises the urgent demand for sustainable sensor solutions. Addressing this challenge, Silicon Austria Labs present a Multifuncti...

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...

Microfluidic actuators based on thermally-induced actuation are gaining intense attraction due to their usage in disease diagnosis and drug release-related devices. These devices use a thermally-expandable polymer called Expancel that expands once its temperature exceeds a particular threshold value. Achieving such devices that are cost-effective a...

In this article, a sustainable, multifunctional, low‐cost, wireless sensor tag is presented. The sensor tag combines three different environmental sensors in one single platform for the dedicated purpose of wireless structural health monitoring of a variety of applications. However, the adaptive design allows the integration of different sensors de...

In this work a versatile approach for the creation of laser-induced graphene (LIG) onto virtually any kind of substrate is demonstrated. The process is based on preconditioning the substrate with a layer of polyimide sealing resin and subsequently laser scribing the LIG structure onto it. By optimizing the laser process, the resulting LIG is firmly...

Flow sensors are essential for a variety of applications in fluidic industries. This paper proposes a liquid flow sensor using a microfluidic channel for macrotubular architectures. The sensor comprised a firm poly(methyl methacrylate) (PMMA) microfluidic channel bridge on a mechanically flexible polydimethylsiloxane (PDMS) platform installed on th...

Currently, silicon (Si)-based island–interconnect structures are emerging in next-generation stretchable electronic devices such as flexible medical implants, soft robotics, and wearables. Various geometrical designs are being used as interconnects for promising stretchable electronic systems. Among them, self-similar serpentine interconnects (SS-i...

Point‐of‐care testing (POC) has the ability to detect chronic and infectious diseases early or at the time of occurrence and provide a state‐of‐the‐art personalized healthcare system. Recently, wearable and flexible sensors have been employed to analyze sweat, glucose, blood, and human skin conditions. However, a flexible sensing system that allows...

As 2007445 stretchable electronics promise to be one of the most influential class of emerging electronics, Muhammad Mustafa Hussain and co‐workers present a comprehensive comparative study on design criteria and performance analysis of prominent fractal designs based on horseshoe and spiral interconnects and their applications with classic materia...

Paper is an essential part of our daily life in many different ways. It is made by compressing cellulose fibers sourced from wood into thin sheets. Paper is an inherently flexible material which can transport liquids through its medium by capillary action without the need of external force. The mesh network of cellulose in paper gives it a unique s...

The potential of the corrugation technique in providing high efficiency (19%), ultra‐lightweight, and ultra‐flexible silicon solar cells which can fully conform to unconventional drone surfaces without affecting the aerodynamic characteristics is demonstrated. Using the different corrugated cells, an extension in the flight time of the AtlantikSola...

Stretchable electronics can be used for numerous advanced applications such as soft and wearable actuators, sensors, bio-implantable devices, and surgical tools because of their ability to conform to curvilinear surfaces, including human skin. The efficacy of these devices depends on the development of stretchable geometries such as interconnection...

Real‐time monitoring of fluid viscosities in tubular systems is essential for industries transporting fluid media. The available real‐time viscometers for tubular systems have major drawbacks, such as using invasive methods with large pressure drops due to flow disturbances, destructive installation processes with permanent tube damage, and limited...

In recent years, small unmanned aerial vehicles (SUAVs) have proven to be exceptionally useful. However, most of the commercially available drones are electric powered and therefore have a short endurance. Solar powered UAVs have recently received increased attention due to their ability to fly continuously for several days using solar energy. For...

With the advent of stretchable electronics, the numerous applications including wearable devices, optoelectronics, and implantable medical devices are realized and thus interconnects that can stretch/deform help to attain these stretchable electronic devices have gained extensive attention. Here, we present a novel spiral interconnect design that u...

In article number 1905399, Muhammad Mustafa Hussain and co‐workers present a small, lightweight, high‐performance and self‐powered cubical system based on a multi‐dimensional integration of circuit (MD‐IC). The system is easily deployable for water security application through continuous, wireless water monitoring in fish farming ponds where the MD...

We present a flexible acoustic sensor that has been designed to detect wheezing (a common symptom of asthma) while attached to the chest of a human. We adopted a parallel-plate capacitive structure using air as the dielectric material. The pressure (acoustic) waves from wheezing vibrate the top diaphragm of the structure, thereby changing the outpu...

We present detailed shape-based analyses to compare the performance of metal foil-based capacitive pressure sensors based on the shape of the diaphragm (top electrode). We perform a detailed analysis on the use of new material and deflection in various shaped diaphragms to act as a performance indicator for pressure-based capacitive sensors. A low-...

Among major food production sectors, world aquaculture shows the highest growth rate, providing more than 50% of the global seafood market. However, water pollution in fish farming ponds is regarded as the leading cause of fish death and financial losses in the market. Here, an Internet of Things system based on a cubic multidimensional integration...

Currently, stretchable electronics has gained intensive attention due to its numerous applications, especially for implantable medical diagnostics and soft actuator based surgeries. A practical stretchable system requires the use of a feedback-assisted structure, i.e., that can detect the movement of the device, analyze the data, and manage the mot...

We present an inclinometer which incorporates a movable electrode acting as a pendulum inside a parallel plate capacitor. The movable electrode acts as the bottom plate while the top plate is a fixed metal with varying area in the shape of a triangle. When the bottom plate moves under the influence of gravity, the overlapping area of the two plates...

The primary focus of modern electronics technology is to increase its functionalities within a smaller footprint at an affordable cost. This creates a new set of design challenges for the already‐existing complex integration and packaging schemes. Here, CMOS‐compatible and heterogeneous multi‐dimensional integrated circuits (MD‐IC) as smart electro...

Poor adherence to prescription medications causes approximately 125 000 deaths per year while an epidemic of a prescription drug overdose has been on the rise, resulting in an alarming number of deaths, 47 055 in 2014 only in the USA. Efforts from governments to address this issue are technologically inadequate. Once a patient leaves the pharmacy w...

In article number 1804385, Muhammad M. Hussain and co‐workers demonstrate an advanced version of the marine skin; a physically compliant standalone biocompatible sensory system for monitoring of marine environment, fully operational at a depth of 2 km continuously for 6 weeks with convenient jacket architecture and may operate up to 1 year. This we...

Advances in marine research to understand environmental change and its effect on marine ecosystems rely on gathering data on species physiology, their habitat, and their mobility patterns using heavy and invasive biologgers and sensory telemetric networks. In the past, a lightweight (6 g) compliant environmental monitoring system: Marine Skin was d...

Current marine research primarily depends on weighty and invasive sensory equipment and telemetric network to understand the marine environment, including the diverse fauna it contains, as a function of animal behavior and size, as well as equipment longevity. To match animal morphology and activity within the surrounding marine environment, here w...

Flexible electronics: plants can now wear sensors The application of flexible electronics has been shifted from epidermal sensors to the surface of individual plant for microclimate and growth condition monitoring. Prof M. M. Hussain and colleagues from King Abdullah University of Science and Technology, Saudi Arabia develop wearable electronic sys...

We report an ultralightweight flexible sensory platform using bare die CMOS chips having a light, temperature, and humidity sensor on a flexible polymer substrate. An application-specified integrated circuit designed and fabricated in a 0.35- $\mu \text{m}$ process is used for signal acquisition, conditioning, and further transfer of data to a bar...

The stretchable display might play a crucial role in transforming many potential applications including wearable electronics, flexible displays for smart TV/devices, health monitoring wristbands, and illumination systems. To date, the most commonly used stretchable displays include the installation of light‐emitting diodes (LEDs) onto a compliant s...

Here we show, Do-It-Yourself (DIY) integration strategy of a low-cost paper sensor based flexible electronic system, using anisotropic conductive tape. The whole assembly is housed inside the cap of a prescription drug container to continuously monitor health of pills. These flexible modular decal sensors are connected with a central flexible decal...

Spiral-island is commonly used configuration for highly stretchable and flexible electronics. Here we show the elongations and stress behaviors of spiral-island system. We use the numerical modeling to reveal the stress states along the arms of spirals, especially when the spirals connect in series and as well as triangular configurations between i...

We present a sensor made from paper using a Do-It-Yourself (DIY) integration strategy that can be attached to the human chest like a stethoscope for real-time asthma symptom monitoring. The sensor is designed such that it resonates around the dominant frequency of wheezing (a common symptom of asthma). This helps the sensor produce large output sig...

Stretchable electronics are commonly used as a diverse class of interconnected architectures, which accommodate large strain during stretching. A systematic understanding of the underlying mechanism of these interconnects, i.e., stress/strain states is essential to optimize the spiral designs. Here, we demonstrate the in-depth structural response o...

Nearly sixty years back when Jack Kilby built the first integrated circuit (IC), it was also the beginning of today's advanced and matured complementary metal oxide semiconductor (CMOS) technology whose arts and science of miniaturization has enabled Moore's Law to double up the number of devices in a given area in every two years. It has also been...

With increased global population, it is important to ensure their basic need: food. While eighty percent of the world's population depend on five agricultural products: rice, wheat, corn, barley, sugar cane, only in 20% areas they can be grown. Often, due to uncertain climatic condition, soil condition, excessive rain, and other natural uncertainti...

In article number 1705759, Muhammad M. Hussain and co‐workers present a comprehensive review on the role of CMOS technology for advanced microfluidics‐based personalized healthcare applications. The advanced and reliable CMOS technology offers a miniaturization opportunity to integrate a broad spectrum of devices involving sensors, actuators, and d...

In article number 1702221, Muhammad M. Hussain and co‐workers demonstrate corrugation architecture enabled ultra‐flexible (140 mm bending radius), high performance (17.2% photovoltaic efficiency) crystalline silicon solar cells (each cell area 1276.2 mm²) on a five‐inch wafer via a lithography‐less Complementary Metal Oxide Semiconductor (CMOS) com...

With the increased global population, it is more important than ever to expand accessibility to affordable personalized healthcare. In this context, a seamless integration of microfluidic technology for bioanalysis and drug delivery and complementary metal oxide semiconductor (CMOS) technology enabled data-management circuitry is critical. Therefor...

Advanced classes of modern application require new generation of versatile solar cells showcasing extreme mechanical resilience, large-scale, low cost, and excellent power conversion efficiency. Conventional crystalline silicon-based solar cells offer one of the most highly efficient power sources, but a key challenge remains to attain mechanical r...

A spiral interconnect array is a commonly used architecture for stretchable electronics, which accommodates large deformations during stretching. Here, we show the effect of different geometrical morphologies on the deformation behavior of the spiral island network. We use numerical modeling to calculate the stresses and strains in the spiral inter...

Electronic system components have thousands of individual field effect transistors (FETs) interconnected executing dedicated functions. Assembly yield of >80% will guarantee system failure since a single interconnect failure will result in undesired performance. Hence, a paradigm shift is needed in the self-assembly or integration of state-of-the-a...