Vaseem Mohammad (Ph.D.)

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• Doctor of Engineering
• Senior Researcher at King Abdullah University of Science and Technology

Currently, silver-nanoparticle-based inkjet ink is commercially available. This type of ink has several serious problems such as a complex synthesis protocol, high cost, high sintering temperatures (∼200 °C), particle aggregation, nozzle clogging, poor shelf life, and jetting instability. For the emerging field of printed electronics, these shortco...

The development of a simple and reliable method for nanoparticles-based ink in an aqueous solution is still a challenge for its inkjet printing application. Herein, we demonstrate the inkjet printing of fractal-aggregated silver (Ag) electrode lines on substrates. Spherical, monodisperse Ag nanoparticles have been synthesized using silver nitrate a...

Flower-shaped CuO nanostructures have been prepared by the simple solution process at 100 °C using copper nitrate, NaOH, and hexamethylenetetramine (HMTA) for 3 h without the use of any complex reagents. The morphological investigations by field emission scanning electron microscope (FESEM) revealed that the flower shaped nanostructures are monodis...

A high-sensitive cholesterol amperometric biosensor based on the immobilization of cholesterol oxidase (ChOx) onto the ZnO nanoparticles has been fabricated which shows a very high and reproducible sensitivity of 23.7 μA mM−1 cm−2, detection limit (based on S/N ratio) 0.37 ± 0.02 nM, response time less than 5 s, linear range from 1.0 to 500.0 nM an...

Global warming events worldwide have made temperature a crucial aspect of environmental monitoring. However, large-scale deployment of environmental temperature sensors to achieve high-resolution and real-time temperature mapping requires low cost and easily integrable sensors. Printing technologies offer low-cost manufacturing, however, the major...

Reconfigurable intelligent surfaces (RISs) suffer from high switch costs and complex switch integration with electromagnetic (EM) structures. In this article, we propose solutions to both of the abovementioned problems by screen printing of low-cost vanadium-dioxide (VO2) switches. The VO2 ink has been prepared in-house and batches of switches have...

Recent advances in electrocardiogram (ECG) diagnosis and monitoring have triggered a demand for smart and wearable ECG electrodes and readout systems. Here, we report the development of a fully screen-printed gentle-to-skin wet ECG electrode integrated with a scaled-down printed circuit board (PCB) packaged inside a 3D-printed antenna-on-package (A...

An additively manufactured phased array antenna is presented in this work that provides simultaneous reconfiguration in frequency, polarization, and beam direction solely in response to magnetic tuning of the underlying ferrite substrate. This design obviates the need for integrated active components, which have been fundamental elements enabling t...

Printed energy storage components attracted attention for being incorporated into bendable electronics. In this research, a homogeneous and stable ink based on vanadium dioxide (VO2) is hydrothermally synthesized with a non-toxic solvent. The structural and morphological properties of the synthesized material are determined to be well-crystalline m...

Magnetically controlled waveguide-based phase shifters are desirable for their high performance, but are bulky and heavy, thus cannot be easily integrated with printed circuit board (PCB) based circuits. To tackle this, substrate-integrated waveguide (SIW) technology has been utilized, which brings the waveguide to a standard PCB, but requires larg...

Chalcogenide Phase Change Materials (PCM) and metal insulator transition (MIT) materials are a group of materials that are capable of switching between low resistance and high resistance states. These emerging materials have been widely used in optical storage media and memory devices. Over the past recent years, there have been interests in exploi...

Optically transparent conductors have paved the way in various optoelectronic and radio frequency devices where high electrical conductivity and optical transparency with mechanical flexibility, as well as large area fabrication are deemed necessary. Printing techniques are viable for fabricating large-area devices with high mechanical flexibilitie...

Screen printing has received significant attention for manufacturing energy storage devices. However, preparing high‐quality inks is still one of the main challenges. Herein, a homogenous and stable ink based on the monoclinic phase of VO2(M) microparticles has been synthesized by a simple hydrothermal process in only 6 h and through non‐toxic solu...

The paper provides an extensive overview on the potential of machine learning in rapid modeling of RF/Microwave devices. To demonstrate the role of machine learning in rapid modeling of RF devices, printed VO 2 RF switch has been selected as an example. Of many supervised machine learning techniques, Artificial Neural Network (ANN) has been preferr...

This article proposes an additive manufacturing compact (30 × 36 × 0.125 mm3), flexible, and reconfigurable antenna with the ability to switch between wideband and dual‐band for wireless electronic devices used in the fifth generation (5G) systems and wireless local area network (WLAN) systems. The antenna consists of a folded branch line and an in...

With the advent of the Internet of things, 5G wireless communication, and smart city applications, demand for a new form of radio frequency (RF) electronics has risen, one that can be mounted or integrated on non‐conformal objects, is mass manufacturable at lower costs, and is optically transparent to maintain the aesthetics of the environment wher...

The need for highly sensitive, environmentally stable, mechanically flexible, and low-cost temperature sensors for on-body measurements has been increasing with the wide adoption of personal Healthcare-Internet-of-Things (H-IoT) devices. Printed electronics (PE) is a good platform for such sensors because it enables the realization of flexible devi...

Printed VO2 RF switch founds immense potential in RF reconfigurable applications. However, their generic electrical equivalent model is still intangible that can be further integrated in CAD tools and utilize for simulation, analysis and design of RF/microwave circuits and systems. The artificial neural network (ANN) has been gaining popularity in...

Smart materials that can change their properties based on an applied stimulus are in high demand due to their suitability for reconfigurable electronics, such as tunable filters or antennas. In particular, materials that undergo a metal–insulator transition (MIT), for example, vanadium dioxide (VO 2 ) (M), are highly attractive due to their tunable...

Modern wireless devices operate on multiple frequency bands, and thus can benefit from frequency reconfigurable Radio Frequency (RF) components, especially filters as they are typically larger in size and are required for every frequency band. In addition, many applications such as wearable electronics, desire stable performance from the devices wh...

Photodetectors (PDs) based on organic–inorganic hybrid materials such as graphene and perovskites have recently emerged at the forefront of the research in optoelectronic devices. Despite the remarkable progress in the performance of optoelectronic devices based on hybrid materials, some aspects such as stability have so far not been thoroughly add...

Numerous medical operations employ blood transfusions, requiring X-ray irradiated blood for safety concerns. Current irradiation techniques can be significantly improved by replacing standard visual indicators with wireless dosimeter tags that automate the process, reducing inefficiencies and eliminating blood wastage. A key requirement of the prop...

The metal–insulator transition (MIT) phase change of vanadium dioxide (VO2) materials has facilitated many exciting applications. Among the various crystal phases of VO2, the monoclinic (M) phase is the only one that demonstrates low‐temperature (≈68 °C) MIT behavior. However, the synthesis of pure VO2 (M) is challenging because various polymorphs,...

In article number 1800276, the use of a Vanadium dioxide(VO2) nanoparticle‐based Metal‐Insulator Transition ink is introduced by Shuai Yang, Atif Shamim, and co‐workers. The VO2 nanoparticles can be printed on various substrates to make radio‐frequency switches which cost only a small fraction of their commercial alternatives. A fully printed recon...

Frequency‐reconfigurable radio‐frequency (RF) components are in high demand due to multiple frequency bands in wireless devices as well as varying frequency‐spectrum standards across the world. An important part of reconfigurable components is a switch; however, existing switches are very expensive, particularly for higher frequencies (≈10s of doll...

Design of a polarization reconfigurable and frequency tunable patch antenna operating in the partially magnetized state of a ferrite substrate is presented in this paper. A low cost additive manufacturing process based on a custom iron-oxide magnetic ink (to realize the magnetic substrate) and a silver-organo-complex metallic ink (to realize the an...

In article number 1700242, the development of an iron oxide nanoparticle‐based dielectric magnetic ink is introduced by Mohammad Vaseem and co‐workers. The iron oxide nanoparticles can be digitally printed in different shapes and thicknesses on any surface. A fully printed antenna is shown in this process, which can be tuned to different frequency...

The field of printed electronics is still in its infancy and most of the reported work is based on commercially available nanoparticle-based metallic inks. Although fully printed devices that employ dielectric/semiconductor inks have recently been reported, there is a dearth of functional inks that can demonstrate controllable devices. The lack of...

Despite the abundance of localization applications, the tracking devices have never been truly realized in E-textiles. Standard printed circuit board (PCB)-based devices are obtrusive and rigid and hence not suitable for textile based implementations. An attractive option would be direct printing of circuit layout on the textile itself, negating th...

There has been significant interest in printing radio frequency passives, however the dissipation factor of printed dielectric materials has limited the quality factor achievable. Al2O3 is one of the best and widely implemented dielectrics for RF passive electronics. The ability to spatially pattern high quality Al2O3 thin films using, for example,...

Fully inkjet-printed three-dimensional (3D) objects with integrated metal provide exciting possibilities for on-demand fabrication of radio frequency electronics such as inductors, capacitors, and filters. To date, there have been several reports of printed radio frequency components metallized via the use of plating solutions, sputtering, and low-...

Inkjet printing or printing for realization of inexpensive and large area electronics has unearthed as an attractive fabrication technique. Though at present, mostly the metallic inks are printed on regular microwave substrates. In this paper, a fully printed multilayer fabrication process is demonstrated where the substrate is also realized throug...

Transparent and stable silver ink based on silver-ethanolamine-formate complex (SEFC) was formulated, wherein both ethanolamine and formate species act as in-situ complexing solvent and reducing agent. as-formulated particle-free SEFC-based inks (22.44 wt% Ag) were applied on glass and polyimide (PI) substrates, followed by annealing the deposited...

The present investigation reports a simple solution process for synthesizing CuO quantum dots at low temperature without using surfactants or templates. Detailed structural characterizations revealed that the as-prepared CuO quantum dots were uniform and dense with high crystallinity. As-prepared CuO quantum dots were used as an ink to prepare CuO...

The present invention relates to a synthesis of copper oxide (CuO) nanoparticles having a particle size of 2-20nm. The present invention relates to a manufacturing method for an ink by using the CuO nanoparticles and a mixed solvent of water, ethanol ethylene glycol. The ethylene glycol is a reducing agent. The present invention manufactures a thin...

Various ZnO materials with shapes of micro-flower, nanosheet and hexagonal nanoplate were synthesized by simple solution process and utilized for scattering layer in a novel dye-sensitized solar cell. All synthesized ZnO structures possessed high purity crystalline wurtzite structures grown in the (001) direction with the size ranges from micromete...

Herein, we report a simple solution process to dope copper oxide (CuO) quantum dots (QDs) with p-type Lithium (Li) dopant that displays both a high electrical and optical property when doped. Specifically, Li-doped CuO QDs were prepared with varying Li-dopant concentration of 0.5 to 1.5 at%. Further, as-synthesized Li-doped CuO QDs were formulated...

Inverted bulk heterojunction (BHJ) solar cells have received much interest due to their stability and lifetime. The inverted bulk heterojunction solar cells are fabricated based on poly(3-hexylthiophene (P3HT)) and Phenyl-C61-butyric acid methyl ester (PCBM). Proper engineering of nanostructures can enhance the adsorption of the sunlight in solar c...

We demonstrated a simple one-step hydrothermal route for the preparation of cupric oxide (CuO) nanoparticles in the form of either nanospheres or urchin-shaped structures. The choice between these two types of structures was easily achieved by switching between NaOH or NaBH4 during the nanoparticles synthesis. The first resulted in the production o...

The present invention relates to P-type zinc oxide nanoparticles and a manufacturing method thereof. Also the present invention relates to a method for manufacturing electronic ink using P-type zinc oxide nanoparticles. The purpose of the present invention is to provide P-type zinc oxide nanoparticles and a manufacturing method thereof wherein the...

The effects of gas atmosphere and sputter time for depositing silver (Ag) on the structural, optical and electrical properties of ZnO/Ag/ZnO transparent conducting oxide (TCO) films have been investigated with sputtering Ag target in Ar or N2. It was found that the properties of the Ag and ZnO/Ag/ZnO films are quite dependent on the gas environment...

Using inkjet-printed copper oxide nanoparticles (CuO NPs) on silver electrodes, the non-enzymatic glucose biosensor was fabricated. The inkjet-printed CuO NPs electrodes produced high and reproducible sensitivity of 2762.5 µA/mM/cm2 at an applied potential of +0.60 V with the wide linear-detecting range of 0.05 - 18.45 mM and the detection limit of...

We investigated the thermoelectric properties of the InSe, InSe/In4Se3 composite, and SrTiO3 (STO) nano-particles dispersed InSe/In4Se3 bulk composites. The electrical conductivity of the InSe/In4Se3 composite with self-assembled phase separation is significantly increased compared with those of InSe and In4Se3–d implying the enhancement of surface...

Well-designed multifunctional D-(+) Glucose capped nickel nanoparticles (G-Ni NPs) with reduced toxicity was synthesized via green chemistry using D-(+) Glucose and ammonia in water. Here, glucose serves as a reducing and capping agent, resulting in highly stable and well-dispersed G-Ni NPs in the solution. The temperature and field dependent magne...

We report herein the synthesis and characterization of copper oxide quantum dots and their cytotoxic impact on mouse C2C12 cells. The utilized CuO quantum dots were prepared by the one-pot wet chemical method using copper acetate and hexamethylenetetramine as precursors. The physicochemical characterization of the synthesized CuO quantum dots was c...

Copper oxide (CuO) quantum dots (QDs) having a diameter of 5–8 nm were synthesized by a simple solution process. The as-synthesized QDs showed a highly crystalline monoclinic phase of CuO with a bandgap of �1.75 eV. The CuO QDs were further formulated as an ink for inkjet printing of CuO field effect transistors (FETs). The ink-jetting behavior of...

Mesoporous crystalline nickel oxide (NiO) nanoclusters have been synthesized by calcination of polystyrene@Ni(OH) 2 core–shells nanospheres which were prepared by esterification of nickel acetate in ethanol under ultrasonication. The as-synthesized NiO nanoclusters containing nanoparticles of 20∼45 nm in diameter are single-crystalline with cubic c...

High aspect ratio ZnO nanorods were grown vertically on ZnO seed layer deposited silicon, glass and polyimide substrates by a solution process at low-temperature using zinc nitrate hexahydrate and hexamethylenetetramine. We studied the effect of polyethlyeneimine (PEI) on the growth of ZnO nanorods. It was found that PEI has a prominent effect on c...

Zinc oxide (ZnO) nanoparticles were synthesized by ultrasonically-assisted solution process without using any surfactants. The as-synthesized spherical ZnO nanoparticles with diameter of 20±5 nm possessed crystalline nature with wurtzite hexagonal phase and showed a blue-shifted near band-edge ultra-violet absorption at ∼340 nm due to quantum confi...

Pure and high-crystalline copper nanoparticles were synthesized at room temperature by reduction of copper nitrate with hydrazine hydrate in cetyltrimethyl ammonium bromide (CTAB) solution without using any extra gases. A parametric study has been carried out in terms of hydrazine concentration, solution pH, and stirring. Pure copper nanoparticles...

Well-crystallised vertically aligned ZnO nanowires have been synthesised on silicon substrate via simple thermal evaporation process without the use of metal catalysis or additives at 750°C by using metallic zinc powder and oxygen gas as source materials for zinc and oxygen, respectively. The X-ray diffraction (XRD) pattern of the grown nanowires r...

Synthesis of ZnO nanorods assembled in flower-shaped spherical morphologies have been grown via solution process by using zinc nitrate hexahydrate (Zn(NO3)2. 6H2O) and sodium hydroxide (NaOH) at low-temperature of 100°C in eight hours. The grown ZnO structures were characterised in terms of their structural and optical properties. The detailed stru...

Large-quality, well-crystallized growth of ZnO nanowires was done via non-catalytic thermal evaporation process on silicon substrate only by using metallic zinc powder and oxygen as source materials for zinc and oxygen, respectively. The electrical properties of the as-grown ZnO nanowires were examined by fabricating a single nanowire based FETs wh...

The effects of additives on the morphologies of CuO structures have been examined in this study. Two different morphologies of CuO structures, i.e., flower-shaped and ellipsoidal-shaped have been synthesized via a facile and low-cost simple solution method by using two different additive molecules, i.e., hexamethylenetetramine and triethylamine, re...

Flower-shaped CuO nanostructures consist of triangular-shaped leaves, having sharpened tips with the wider bases, have been grown by simple aqueous solution process. Detailed structural observations exhibited the nanocrystalline nature with monoclinic structure for the as-synthesized nanostructures. The photocatalytic activity of the nanostructures...

Flower-shaped β- Ni(OH)2 structures composed of thin nanosheet networks have been synthesized via the simple aqueous solution route by using nickel chloride and ammonium hydroxide at 65 ∘C in 4 h. The general morphological observations revealed that the flowers are composed of thin nanosheets which were connected to each other in such a manner that...

Urchin-like and sheet-like CuO structures have been synthesized in a large-quantity via simple solution process. Urchin-like CuO structures were obtained by the copper powder, present in the strong alkali solution of copper nitrate, in which small CuO nanosheets were nucleated and grown on the outer surfaces of copper powder moieties. Sheet-like st...

ZnO Nanostructure-based Chemical and Biosensors......