Essay On Nanowires

This book by Hornyak and partners brings into perspective an integrated introduction to the nanoscience and its applications. The book further presents illustrations in full color regarding nanotechnology. From these illustrations, I will be developing a detailed understanding of the fundamentals of nanotechnology. I will also be acquiring knowledge on the different aspects of nanotechnology including chemistry, physics, and biology. The authors also discuss the impacts of nanotechnology on the society, which is also an important part of my paper. I will be gathering information on industrial concerns associated with nanotechnology in manufacturing and safety. This will broaden my discussion to a better-informed approach in explaining implications of nanotechnology in the modern

The exceptionally high surface-to-volume ratio of thin one-dimensional nanostructures has enabled them to function well with inherently high sensitivity and short response time. A common sensing device can be produced by configuring high performance, field-effect nanowire transistors, in which the specific function of sensing is achieved by coupling a recognition group and the surface of the nanowire. The device incorporates a Si nanowire with distinct p- or n-type doping, source drain electrodes that are insulated from the environment, and a microfluid device for delivery of solutions. Since the Si nanowire is suspended in ethanol and flow aligned on substrates, and the contact leads are characteristic of emerging with electron –beam lithography, for manufacturing purposes, it would be beneficial to grow the device directly from

Nanotechnology is the study of particles on the nanoscale with, at least one dimension being less than 100nm. (Chen, Schluesener, 2008) Nanoscale particles can come in many shapes and sizes, ranging from 100 - 1 nm. These particles can be found as rods, cones, spheres and many more complex matrices and patterns as seen in figure 1.(Champion, Katare, Mitragotri, 2007) Nanosilver will form a roughly spherical shape as can be seen in figure 2. (Utopia Silver Supplements, 2012)

To optimize the properties of nano-material and atomic level needs an elemental probe with resolution of <1nm. The nano scale probe helpful to provide the reproducible control over defects.

Wireless technology is widely used throughout different countries and governments, and is one of the most fast-growing and needed technologies on the market today. While in the past it has been looked at as something that is not needed, now is necessary. Most companies have main business functions that occur outside the main office, and taking a laptop computer into the field helps the need to complete services particular to that business. Globally, the wireless field is expanding and both people and business are beginning to heavily depend on its services all over the world. Wireless technology has also become more popular in the field of education and is being taken in by not only university

The aim of this paper is to analyse the use of nanotechnology in alternative energy production, storage and as a means of reducing energy consumption.

Nano is associated with anything in the dimensional range of nanometers (1/10^9 meter). A nanowire is a long cylindrical specimen having diameter in the range of few nanometers with an unconstrained length. Nanotubes are similarly hollow nanowires and consists of tubes of 1 atom wall thickness. As a whole we work with material properties in bulk and the quantum effects of atoms were averaged out. With nanotubes and nanowires we work with materials in single dimension and atoms start exerting significant quantum effect on mechanical properties and a wide range of new properties and applications are being discovered.

Fig. 1a shows the UV–vis absorption spectrum of the as-prepared Ag@C-nanowires suspended in deionized water, exhibiting a main peak at 386 nm and a shoulder peak at 360 nm, corresponding to the optical finger print of silver nanowires. The absorption peak at 360 nm is attributed to the longitudinal plasmon mode of silver nanowires and is similar to that of the bulk silver, and the absorption peak at 386 nm is attributed to the transverse plasmon mode of silver nanowires. These two absorption peaks suggest that pure Ag@C-nanowires were successfully synthesized, and the Ag@C-nanowires had a sheath thickness of ~10 nm, consistent with our electron microscopic studies shown in Fig. 2c. Fig. 1b shows the typical X-ray diffraction (XRD) pattern

\textit{et al.} \cite{ZVD} of a core-shell nanowire growth; the prior versions of this model can be found in Refs. \cite{SVT,Tersoff,RS}. {\bf These earlier works consider a thick alloy film that is thermodynamically stable against phase separation. Also, the thermodynamic surface segregation effects are not considered, and in Refs. \cite{SVT,Tersoff} the bulk diffusion is ignored. Another model worth mention is Ref. \cite{KB}, which adds the surface electromigration to the framework of Refs. \cite{SVT,Tersoff}. By contrast, the recent model \cite{ZVD} is thermodynamically consistent, thus it accounts for the surface and bulk diffusion, the surface and bulk phase separation (a thermodynamically unstable alloy is allowed), and for the thermodynamic and kinetic surface segregation.} In the analysis of this model the authors focus on the effects of the surface

Nanoscience is the branch of science which studies the phenomena on materials at atomic, molecular and macromolecular scales, where the properties can differ very much from that of bulk materials. Nanoparticles are like a bridge between bulk materials and atomic or molecular structures. Despite of its size, the bulk materials possess constant physical properties. But at nano-scale size dependent properties are generally observed. Hence in general the properties of materials change as their size approaches the nanoscale which are far different from those of their bulk counterparts. Nanotechnology comprises the technological applications of nanoscience, which includes the synthesis, design, characterization and application of structures,

In top-down techniques, clusters are synthesized from larger nanoparticles or bulk metal. Etching of nanoparticles using ligands (as thiols) is one of the most top-down techniques can be used for the synthesis of metal clusters. Removing the surface atoms or break the metal nanoparticles into smaller clusters by using the etching capacity of such ligands will lead to synthesize stable quantum clusters. For example, Habib et al. has used the etching of mercaptosuccinic acid protected gold nanoparticles with excess glutathione to yield small photoluminescent gold clusters either with 8 or 25 gold atoms [16]. Polyethylenimine as multivalent coordinating polymers can also be used to etch preformed colloidal gold nanocrystals producing highly fluorescent nanoclusters [17]. it is well confirmed that small noble metal nanoclusters display excellent catalytic activities such as aerobic oxidation of thiophenol [18], propene epoxidation[19], oxidation of styrene [20], p-nitrophenol reduction with NaBH4 [21] and the reduction of methylene blue with hydrazine [22].

The focus of this section will be on the growth mechanism, characterization and applications of TiO2 nanowires. Three growth mechanism will be reviewed are sol-gel, direct oxidation, and hydrothermal. The characterization of TiO2 nanowires are analyzed by the SEM, TEM, and Ramen spectroscopy. The current and future application of TiO2 will be discussed in the last part of this section. Three applications of TiO2 nanowires are explored in this survey: (1) photocatalytic (2) gas sensing (3) dye-sensitized solar cell.

Nanoscience involves a study of nanotechnology and nanomaterials, of which at least one of the dimensions is in 1-100 nm range. Over the past two decades, nanomaterials have been a topic of both scientific and technological interest2. Due to their compact dimension and enlarged surface area, these materials possess new physical and

To overcome the terminology and nomenclature issues, a standardization committee, ISO TC229 "Nanotechnologies", started in 2005, and a joint working group with IEC 113 "Nanotechnology Standardization for Electrical and Electronic Products and Systems"

Nanotechnology, which is one of the new technologies, is the science and technology of designing, constructing and creating of novel nano-scale structure, 1nm to 100 nm in size, with huger quality, novel performance properties, along with fewer defects compared with those of the bulk material (Siqueira et al., 2010). An increasing interest from the scientific community to work with materials in nano metric scale has been observed since the introduction of the concept of nanotechnology by Richard Feynman in 1959. The last decade has seen advancement in every side of nanotechnology such as nano particles and powders, nano layers and coats, electrical, optic and mechanical nano devices, and nano structured biological materials (Bhattacharyya et al., 2009). Nanoscale structures permit the control of fundamental properties of materials without changing the materials’ chemical status (Murphy et al., 2011).