Bharti Singh

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Verified

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• Doctor of Philosophy
• Professor (Assistant) at Delhi Technological University

For the development of a small-scale focal plane array based on n + np HgCdTe/CdZnTe (MCT/CZT), the extent of inhomogeneities and elemental distribution in the n + np region, as well as at the interface, were studied at the nanoscale and correlated with findings from microscale characterization, including electrical characterization. In the n + np...

Synergistic combination of metal/metal oxide with semiconductor as nano-hybrid composites (NHC), exhibits unmatched potential for developing nano-biosensors with superior stability, sensitivity, and selectivity. In this study, we report the fabrication of hydrothermally synthesized 3Dsingle bond2D NHC based on self-assembled Cu/CuXO-hBNNS for label...

A triboelectric nanogenerator (TENG) working on a contact electrification and electrostatic induction principle is a promising energy source for fulfilling the energy demand of low power electronic devices by converting the ambient mechanical energy to useful electrical energy. Here, a polymer nanocomposite film-based triboelectric nanogenerator ha...

Recent developments in flexible memories, neuromorphic computing, and other fields have generated a lot of interest in memristive devices based on two-dimensional materials. Due to its capacity for data storage and quick working speed, two-terminal non-volatile memory devices are more efficient and incredible. The need for memory that is flexible,...

Organic–inorganic hybrid nanocomposites (OIHN), with tailored surface chemistry, offer ultra-sensitive architecture capable of detecting ultra-low concentrations of target analytes with precision. In the present work, a novel nano-biosensor was fabricated, acquainting dynamic synergy of reduced graphene oxide (rGO) decorated hexagonal boron nitride...

The current study observes the effects of pure reduced graphene oxide (rGO) inclusion on the resistive switching properties of tin oxide (SnO2) based resistive memory device. In our previous work, it has been demonstrated that the incorporation of rGO in SnO2 nanocomposite induced bipolar resistance switching with enhanced ON/OFF ratio. Here, we ha...

In this paper, undoped BaBi2−x−yNb2ErxYbyO9 (BBN), Er³⁺ doped BBN, and a series of Er³⁺/Yb³⁺ co-doped BBN ferroelectric ceramic is synthesized by the solid-state method to study the structural, dielectric, ferroelectric, and energy storage behavior of the prepared ceramic. XRD spectra revealed orthorhombic geometry and Fmmm phase group of each prep...

Flexible non-volatile memory devices have been gaining interest in expanding the digital data storage world. Due to the burgeoning advancement in the healthcare industry, the Internet of Things, and wearable electronics, the demand for ultra-thin, low-power, and flexible memory is increasing. Further, the advancement of synthesis procedures for two...

Advancements in nanostructure engineering have evolved ultrathin geometry and controlled morphology in inorganic layered materials consequently endowing ultrahigh specific surface area, highly permeable mass transport channels, and bio-compatible, bio-sensitive, bio-selective sites that render them appealing candidate as nano-biosensor. In the pres...

With the advancement in the wearable technologies such as, smart watches, electronic skin, and wearable portable device, scavenging the biomechanical energy from human movements have gained considerable attention for designing self-sustainable power system. Here, we have reported a flexible piezoelectric device that can be conformably adhered to th...

Resistive switching random access memory (ReRAM) where the resistance of the active semiconducting layer can be changed as a function of applied voltage has been becoming popular due to its simple structure and design. In the present study, we have used MoS2–SnO2 nanocomposite as a resistive switching material, where the effect of MoS2 weight perce...

A green energy generating device that can meet the energy requirements of future technologies without contaminating our environment is increasingly in demand. These devices can harvest energy from ambient sources that are already present in our surroundings. Triboelectric nanogenerator (TENG) has received a lot of attention as a potential sustainab...

Defect prediction is an extremely new software quality assurance study field. A project team’s goal is to provide a high-quality product with no or few flaws. The quantity of flaws in a product is connected to its quality, which is also restricted by time and money. As a result, defect prediction is critical in the field of software quality. This s...

Functionalizing graphene beyond its intrinsic properties has been a key concept since the first successful realization of this archetype monolayer system. While various concepts, such as doping, co-doping, and layered device design, have been proposed, the often complex structural and electronic changes are often jeopardizing simple functionalizati...

Resistive switching memory, which combines simple architectures with the ability of high density, high switching speed, and low power consumption, has sparked a lot of attention in the field of non-volatile memory devices. In the present work, the resistive switching performance of reduced graphene oxide (RGO) and tin oxide (SnO2) based nanocomposi...

This study focusses on fabricating flexile piezoelectric nanogenerators (PENGs) based on polyvinyl fluoride (PVDF) – tin diselenide (SnS2) composite. 2D-SnS2 was synthesized via simple hydrothermal method and was mixed with PVDF to form the nanocomposite solution, which was then drop casted to form flexible thin films. The phase purity of prepared...

A self-powered wearable device, with the energy harvester as a source of energy that can scavenge the energy from ambient sources present in our surroundings to cater the energy needs of portable wearable electronics, are becoming more widespread due to their miniaturization and multifunctional characteristics. Triboelectric and piezoelectric nanog...

One dimensional TiO2 nanorods (TONRs) hybrids have enormous potential for photocatalytic applications. Integrating TONRs with plasmonic Nanoparticles (PNPs) to form hybrid structures enhances its photocatalytic activity by local surface plasmonic resonance (LSPR) effect. The Present work reports PNPs decorated TONRs for visible light driven photoca...

The current work shows first of its kind, where the systematic effect of the chalcogen atom of the Transition metal dichalcogenides (TMDCs) (MoS2, MoSSe, MoSe2) and polyvinylidene fluoride (PVDF) based composites on the piezoelectric performance of the fabricated piezonanogenerator has been investigated. Flexible PVDF/TMDCs composite thin films hav...

Self-powered devices, which can harvest energy from various ambient mechanical sources, are being explored and have immense potential. In this regard, piezoelectric nanogenerators have attracted considerable attention for their ability to harvest energy from the kinetic movements of the body. In this paper, we have investigated the enhancement in t...

Recently, piezoelectric materials embedded polymer matrices have generated a lot of traction by enhancing the output performance of nanogenerators. In the current research, the amelioration in the output performance of PVDF-MoS2 composite-based piezoelectric nanogenerators (PENG) as a result of varying MoS2 concentration has been reported. To start...

One-dimensional (1D) titanium dioxide (TiO2) nanostructures have enormous attention for next-generation renewal energy resources. In reference to that, present work reports the effect of different voltages (40 V and 60 V) on the structural and morphological properties of 1D-TiO2 nanotubes (TONTs) and their hybrids by grafting of bimetallic nanopart...

Metal oxide nanostructure hybrid materials have garnered focused attention for next-generation memory-based devices. TiO2 nanostructure hybrids dwell in that league of materials. In reference to that, the present work reports the growth of mixed-phase TiO2 nanostructures (MxPh-TNs) and their hybrids by grafting metal nanoparticles (MNPs). MxPh-TNs...

Enhacement of beta phase of PVDF after the addition of transition metal dichalcogenides

In the present work, we have studied the enhancement of polar crystalline β‐phase of PVDF, which is responsible for its piezoelectric property, after the addition of transition metal dichaclcogenides (TMDs). MoS2 and MoSe2, which belong to the library of TMDs were synthesized by hydrothermal method and then we have synthesized the freestanding flex...

Our primary source of clean, abundant energy is the sun; the sun deposits 120,000 TW of radiation on the surface of the Earth, far exceeding human needs even in the most aggressive energy demand scenarios. All routes for utilizing solar energy exploit the functional steps of capture, conversion, and storage. The sun’s energy arrives on earth as rad...

Any object on the earth’s surface having its temperature around 28°C acts as a strong source of thermal infrared radiation emitting mostly in 3–30 μM range. Thus, such objects become a source of infrared radiation with emission range overlapping with solar spectra. This overlapping is more significant in the 3–5 μM range. As the temperature of the...

Herein, we report the synthesis of rhombohedral ilmenite CdSnO3 nanoparticles through coprecipitation method. The effect of sintering temperatures on phase purity of nanoparticles was observed from X-ray diffraction (XRD) analysis and further their structure parametres were determined. XRD patterns confirmed the formation of stable and phase pure r...

Orthorhombic as well as cubic phase Cd2SnO4 nanoparticles have been synthesized by one step solution combustion method. X-ray diffraction result confirms the high crystallinity and phase purity of the synthesized nanoparticles. TEM images reveals, the synthesized nanoparticles have spherical morphology with an average diameter of 30 nm for both pha...

The phenomenon of resistive switching is based on nanoscale changes in the electrical properties of the interface. In the present study, conductive atomic force microscope based nanoscale measurements of copper oxide (CuO)-multilayer graphene (MLG) hybrid interface based devices have been carried out to understand changes in the electrical properti...

The current-voltage and resistive switching properties of Cu2O and CuO based resistive random access memories in metal-oxide-metal structure with Cu as bottom electrode and different metals (Ti, Ag, Au and Pd) as top electrodes have been investigated. The observation of resistive switching in Cu2O and its absence in CuO based devices indicates that...

This study shows that tip loading force in conductive atomic force microscope (CAFM) is an important parameter determining electronic properties of tip-sample interface. At higher tip loading force, electrochemical breakdown of moisture layer and redox reactions cause changeover from unipolar to bipolar switching in Pt tip-Cu2O junction. Change in...

This study reports the change in the structural and junction properties of Ti-CuO-Cu structure on incorporation of a 2-dimensional (2D) organic layer comprising of n-type hexafluoro-hexa-peri-hexabenzocoronene (6F-HBC). A bipolar resistive switching is observed in the device having interface between sputter deposited copper oxide (CuO) and vacuum s...

With the objective of understanding the role of size and current level of filamentary regions on the resistive switching parameters, detailed conductive atomic force microscope investigations of resistive memory cells having different dimensions have been carried out in this study. Cu-Cu(2)O-Ti memory cells having dimensions of 150, 50 and 25 μm ha...

This study reports a bipolar resistive switching device based on copper oxide (CuO)-multilayer graphene (MLG) hybrid interface in complete contrast to the ohmic and rectifying characteristics of junctions based on individual MLG and CuO layers. The observed shift and the occurrence of additional O1s, Cu2p, and C1s core level peaks indicate electron...

Interfacial interaction at hybrid interfaces results in structural and electronic properties different from organic and inorganic components. In this study, x-ray photoelectron spectroscopy analysis carried out on CuO-hexa-peri-hexabenzocoronene (HBC) bilayers shows the appearance of an additional C 1s peak at lower energy due to Cu-C interaction....

This study reports reversible and unipolar resistive switching in oxide bilayer structure due to the conversion of rectifying CuInO ₂– CuO semiconductor heterojunction to metal-semiconductor CuInO ₂– Cu Ohmic contact. High resolution transmission electron microscopy and conducting atomic force microscopy studies establish that...