An ambient solution-state method for making uniform nanobrushes composed of oriented 1D silver nanowires (NWs) with aspect ratios of 102-104 is reported. These structures are grown over cm2 areas on conducting surfaces. Assemblies of NWs form uniform nanobrush structures, which can capture micrometer-sized objects, such as bacteria and particulate matter. Variation in composition produces unique structures with catalytic properties. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Pradeep Thalappil

Department Of Chemistry

Depanjan Sarkar

Aspect ratio

Mass spectrometry

Nanostructured materials

Nanowires

1-D NANOSTRUCTURES

Catalytic properties

CONDUCTING SURFACES

DROPLET SPRAYS

In compositions

NANOBRUSHES

Particulate Matter

SILVER NANOWIRES

Drops

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Advanced Materials

Mass spectrometry (MS), a hundred-year-old subject, has been a technique of profound importance to molecular science. Its impact in solid-state materials science has not been evident, although many materials of modern science, such as fullerenes, have their origins in MS. Of late, mass spectrometric interface with materials is increasingly strengthened with advances in atomically precise clusters of noble metals. Advances in instrumentation along with recent developments in synthetic approaches have expanded the chemistry of clusters, and new insights into matter at the nanoscale are emerging. High-resolution MS coupled with soft ionization techniques enable efficient characterization of atomically precise clusters. Apart from that, techniques such as ion mobility, tandem MS, etc. reveal structural details of these systems. Growth, nucleation, and reactivity of clusters are also probed by MS. Some of the recent advancements in this field include the development of new hyphenated techniques. Finer structural details may be obtained by coupling MS with spectroscopic tools, such as photoelectron spectroscopy, vacuum ultraviolet spectroscopy, etc. With such advancements in instrumentation, MS can evolve into a universal tool for the characterization of materials. The present review captures highlights of this area. © 2019, The Author(s).

Fulltext

NPG Asia Materials

The emerging interface of mass spectrometry with materials

We introduce a new and simple method for synthesizing different phases of copper sulphide nanostructures using electrospray deposition (ESD) of molecular sulphur in the form of droplets on metallic copper surfaces under ambient conditions. Different phases of copper sulphide nanostructures were created by controlling the deposition time. Time dependent electron microscopy reveals conversion of the Cu2S nanopyramids to Cu1.8S platelets during the course of ESD. In the beginning of deposition, direct interaction between sulphur ions and metallic copper creates Cu2S nanopyramids followed by subsequent slow diffusion of sulphur leading to the formation of copper deficient Cu1.8S platelets. A detailed characterization of both the nanostructures was performed by using different microscopic and spectroscopic tools such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, powder X-ray diffraction (PXRD) and X-ray photoelectron spectroscopy (XPS). We have also studied the optical properties of these nanostructures in both UV-Vis and near infrared (NIR) regions. The characteristic broad peaks in the UV-Vis region of Cu2S nanopyramids indicate the photosensitive nature of the material. A positive photocurrent response was observed from the Cu2S nanopyramids under electrochemical conditions, while Cu1.8S nanostructure shows an intense localized surface plasmon (LSPR) peak in the NIR region indicating its metallic nature. Current-voltage (I-V) measurements showed metallic conductivity in them. © 2019 The Royal Society of Chemistry.

Journal of Materials Chemistry A

Electrospray deposition-induced ambient phase transition in copper sulphide nanostructures

We describe an ambient ion-based method to create free-standing metal nanosheets, which in turn are composed of nanoparticles of the corresponding metal. These nanoparticle-nanosheets (NP-NSs) were formed by the electrospray deposition (ESD) of metal ions on a liquid-air interface leading to nanoparticles that self-organize under the influence of electrohydrodynamic flows, driven by the electric field induced by the applied potential. Such a two-dimensional organization of noble metals is similar to the assembly of molecules at liquid-air interface and has the possibility of creating a category of new materials useful for diverse applications. Enhanced catalytic activity of the formed NP-NSs for Suzuki-Miyaura coupling reaction was demonstrated, which was attributed to their large surface-to-volume ratios. © 2018 American Chemical Society.

Journal of Physical Chemistry C

Electrohydrodynamic Assembly of Ambient Ion-Derived Nanoparticles to Nanosheets at Liquid Surfaces

Water scarcity is one of the most alarming problems of the planet. An ambient ion based method is developed to make hydrophilic-hydrophobic patterned silver nanowires (NWs) as humidity harvesters of unprecedented efficiency. Such water harvesters are developed by two-step surface modification of the as-synthesized NWs (known from a report earlier) using electrospray. These patterned NWs of ≈20 µm length and ≈200 nm width grown over a relatively large area (2 × 2 cm2) exhibit atmospheric water capture (AWC) efficiency of 56.6 L m−2 d−1, the highest reported so far. The whole fabrication process of the surface is performed under ambient conditions with a home-built nanoelectrospray ion source, without the help of any sophisticated instrumentation. The synthesized material combines and mimics two exciting examples of AWC in nature, which are cactae and Namib Desert beetles, which utilize AWC for their living. It is believed that the combination of the special features of the above two natural species helps to achieve the highest water capture efficiency reported till date. A working prototype using this surface for AWC is also fabricated. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Advanced Materials Interfaces

Patterned Nanobrush Nature Mimics with Unprecedented Water-Harvesting Efficiency

Ultraporous Electron-Depleted ZnO Nanoparticle Networks for Highly Sensitive Portable Visible-Blind UV Photodetectors

Nature Communications

Transparent air filter for high-efficiency PM2.5 capture

Faraday Discussions

Enhanced Raman scattering from aromatic dithiols electrosprayed into plasmonic nanojunctions

Nano Research

Fabrication and properties of well-ordered arrays of single-crystalline NiSi2 nanowires and epitaxial NiSi2/Si heterostructures

Accounts of Chemical Research

Review of Chemical Vapor Deposition of Graphene and Related Applications

Metallic Nanobrushes Made using Ambient Droplet Sprays

Journal	Data powered by TypesetAdvanced Materials
Publisher	Data powered by TypesetWiley-VCH Verlag
ISSN	09359648
Open Access	No