Microwave-assisted preparation of inorganic nanostructures in liquid phase.

Two-dimensional (2D) layered inorganic nanomaterials have attracted huge attention due to their unique electronic structures, as well as extraordinary physical and chemical properties for use in electronics, optoelectronics, spintronics, catalysts, energy generation and storage, and chemical sensors Graphene and related layered inorganic analogues have shown great potential for gas-sensing applications because of their large specific surface areas and strong surface activities This review aims to discuss the latest advancements in the 2D layered inorganic materials for gas sensors We first elaborate the gas-sensing mechanisms and introduce various types of gas-sensing devices Then, we describe the basic parameters and influence factors of the gas sensors to further enhance their performance Moreover, we systematically present the current gas-sensing applications based on graphene, graphene oxide (GO), reduced graphene oxide (rGO), functionalized GO or rGO, transition metal dichalcogenides, layered II

Gas sensing in 2D materials

Wearable electronics is expected to be one of the most active research areas in the next decade; therefore, nanomaterials possessing high carrier mobility, optical transparency, mechanical robustness and flexibility, lightweight, and environmental stability will be in immense demand. Graphene is one of the nanomaterials that fulfill all these requirements, along with other inherently unique properties and convenience to fabricate into different morphological nanostructures, from atomically thin single layers to nanoribbons. Graphene-based materials have also been investigated in sensor technologies, from chemical sensing to detection of cancer biomarkers. The progress of graphene-based flexible gas and chemical sensors in terms of material preparation, sensor fabrication, and their performance are reviewed here. The article provides a brief introduction to graphene-based materials and their potential applications in flexible and stretchable wearable electronic devices. The role of graphene in fabricating ...

Flexible Graphene-Based Wearable Gas and Chemical Sensors

Recent advances in electrochemical non-enzymatic glucose sensors - A review.

Electrically–transduced sensors, with their simplicity and compatibility with standard electronic technologies, produce signals that can be efficiently acquired, processed, stored, and analyzed. Two dimensional (2D) nanomaterials, including graphene, phosphorene (BP), transition metal dichalcogenides (TMDCs), and others, have proven to be attractive for the fabrication of high–performance electrically-transduced chemical sensors due to their remarkable electronic and physical properties originating from their 2D structure. This review highlights the advances in electrically-transduced chemical sensing that rely on 2D materials. The structural components of such sensors are described, and the underlying operating principles for different types of architectures are discussed. The structural features, electronic properties, and surface chemistry of 2D nanostructures that dictate their sensing performance are reviewed. Key advances in the application of 2D materials, from both a historical and analytical pers...

Electrically-Transduced Chemical Sensors Based on Two-Dimensional Nanomaterials

Pollution due to heavy metals is currently a serious problems affecting water bodies. The removal of heavy metals is of great concern due to their toxicity at trace levels and accumulation in the biosystem. Here we review the technical feasibility of biosorption and ion exchange methods for the removal of various heavy metals from the aqueous media. Chemical pretreatment of low-cost biosorbents are presented. Chemically modified biosorbents exhibit far better adsorption capacities than unmodified ones. We also highlighted the effect of pH on the biosorption for maximal uptake of heavy metals, because pH modifies the surface charge of the biosorbent as well as the speciation of heavy metals.

Removal of heavy metal ions from aqueous system by ion-exchange and biosorption methods

This paper reports the simple and facile synthesis, characterization and chemical sensing properties of iron oxide (-Fe2O3) nanoparticles. Iron oxide nanoparticles were synthesized by a simple hydrothermal process and characterized in details of their morphological, structural and compositional properties. The iron oxide nanoparticles were found to be well-crystalline and grown in very high density which were used as efficient electron mediators for the fabrication of highsensitive phenyl hydrazine sensor. The fabricated hydrazine sensor demonstrated a high sensitivity of 57.88 Am M −1 cm −2 with an experimental detection limit of 97 M. The observed linear dynamic range (LDR) for the fabricated sensor was 97 m−1.56 mM. The presented work demonstrates that iron oxide nanoparticles can be used as a potential electron mediator for the fabrication of efficient chemical sensors.

Synthesis and Characterization of Iron Oxide Nanoparticles for Phenyl Hydrazine Sensor Applications

This paper reports a successful synthesis, characterizations and an efficient chemical sensor application of as-synthesized Ce-doped ZnO nanorods. The Ce-doped ZnO nanorods were synthesized by simple low-temperature hydrothermal process. The as-synthesized nanorods were characterized in terms of their morphological, structural and compositional properties. The morphological and structural studies revealed that the synthesized nanorods were grown in high-density and possessed well-crystallinity. The as-synthesized nanorods were used as an effective electron mediator for the fabrication of an efficient hydroquinone chemical sensor. The fabricated sensor exhibited high and reproducible sensitivity of ∼10.218 ± 0.01 mA cm −2  mM −1 and detection limit of ∼10 nM. To the best of our knowledge, this is the first ever report on the fabrication of hydroquinone chemical sensor using Ce-doped ZnO nanostructures. This work demonstrates that simply synthesized Ce-doped ZnO nanostructures can be used as an effective electron mediator for the fabrication of chemical sensors.

G. N. Dar

Papers

Removal of heavy metal ions from aqueous system by ion-exchange and biosorption methods

Synthesis and Characterization of Iron Oxide Nanoparticles for Phenyl Hydrazine Sensor Applications

Ce-doped ZnO nanorods for the detection of hazardous chemical

Growth and properties of Ag-doped ZnO nanoflowers for highly sensitive phenyl hydrazine chemical sensor application.

Ultra-high sensitive ammonia chemical sensor based on ZnO nanopencils.