Towards Nanowire (Bio) Sensors

Dawson, Karen; O’Riordan, Alan

doi:10.1088/1742-6596/307/1/012004

Cited by 8 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nowadays, metallic and semiconductor nanowires draw considerable attention due to their beneficial physical and chemical properties. Specifically, mechanical and electrical properties of gold nanowires have led to their exploitation for bioelectrical signal detection [1][2][3]. At the same time the possibility of tuning the band gap width in silicon nanowires makes them particularly suitable for optoelectronics applications [4][5].…”

Section: Introductionmentioning

confidence: 99%

Diversity of anisotropy effects in the breakup of metallic FCC nanowires into ordered nanodroplet chains

2020

View full text Add to dashboard Cite

We have analyzed the expressed manifestation of the anisotropy of surface energy density in the dynamics of ultrathin nanowires, which break up into disjointed clusters when annealed below their melting temperature. The breakup process is studied for different temperatures and orientations of the nanowire axis relative to its internal crystal structure using the Monte Carlo kinetic method. We have also presented an approximate analytical model of the instability of nanowires. Generally, the interpretation of experimental results refers to the theoretical model developed by Nichols and Mullins, which is based on conceptions about the Rayleigh instability of liquid jets. In both cases, the theories -which do not take into account the anisotropy of surface energy density -predict the breakup of a nanowire/liquid jet with radius into fragments with an average length Λ = 9 . However, the observed value, Λ/ , often deviates from 9 either to lower values or to substantially greater ones (up to 24-30). Our results explain various observed features of the breakup and the significant variations in the values of its parameter Λ/ depending on experimental conditions. In particular, the ambiguous role of exchange by atoms of the surface of a nanowire with the surrounding layer of free atoms formed as a result of their rather intensive sublimation, which occurs in a number of cases, has been investigated. We have shown that this exchange can lead both to a decrease, and to a significant increase, in the parameter Λ/ . The obtained results could be potentially useful in applications such as the development of optical waveguides based on ordered nanoparticles chains.

show abstract

Section: Introductionmentioning

confidence: 99%

Diversity of anisotropy effects in the breakup of metallic FCC nanowires into ordered nanodroplet chains

2020

View full text Add to dashboard Cite

show abstract

“…GNWs are one-dimensional nanostructures with high aspect ratio (L/D > 500) [ 7 ]. Because of the high surface to volume ratio, large anisotropy and self-assembly ability, GNWs have been used as building blocks for nanostructured sensing devices in chemistry and biochemistry fields [ 8 ]. GNWs can be divided into two types, single crystalline and polycrystalline.…”

Section: Uncommon Gold: Old Materials With New Applicationsmentioning

confidence: 99%

“…The polycrystalline GNWs, with larger diameter (>5 nm), are also synthesized by assembly of stable atomic clusters, but they have shown different properties with single crystalline GNWs [ 13 ]. For example, polycrystalline nanowires exhibit excellent mechanical strength [ 14 ], but their electron transport properties are not as good as single crystalline GNWs, as their grain boundaries result in lower conductivity [ 8 , 15 ].…”

Section: Uncommon Gold: Old Materials With New Applicationsmentioning

confidence: 99%

“…GNWs can be used as important building blocks for nanotechnology because of their excellent physiochemical properties. As for unusual gold nanostructures, 70% of the gold atoms of ultrathin GNWs are at the surface, which make them an excellent nanoelectrode candidate in electrochemical applications, such as pressure sensors, DNA detector, interconnects and nanoelectrodes [ 8 ].…”

Section: Why Use Gold Nanostructures In Sensors?mentioning

confidence: 99%

See 1 more Smart Citation

New Gold Nanostructures for Sensor Applications: A Review

et al. 2014

View full text Add to dashboard Cite

Gold based structures such as nanoparticles (NPs) and nanowires (NWs) have widely been used as building blocks for sensing devices in chemistry and biochemistry fields because of their unusual optical, electrical and mechanical properties. This article gives a detailed review of the new properties and fabrication methods for gold nanostructures, especially gold nanowires (GNWs), and recent developments for their use in optical and electrochemical sensing tools, such as surface enhanced Raman spectroscopy (SERS).

show abstract

“…Gold nanowire electrodes have also been fabricated and their potential use in biosensors demonstrated. O'Riordan and colleagues [67,68] have fabricated gold nanowire electrodes (100 nm Â 40 μm) using a hybrid electron beam lithography process which are easily contactable with overlaid interconnecting electrodes (Fig. 3.14).…”

Section: Nanoelectrochemical Sensorsmentioning

confidence: 99%

Biosensor Design with Molecular Engineering and Nanotechnology

Johnson

Trzebinski

et al. 2014

Body Sensor Networks

View full text Add to dashboard Cite

The concept of a biosensor is well established and the idea of integrating a molecular recognition layer with a base sensor, such that analyte binding or reaction at the former results in a measureable change (in current or voltage) in the latter has seen many ingenious embodiments. Despite this and the huge amount of research worldwide in biosensors, as outlined in Chap. 2, many challenges still remain in building reliable, long-lived biosensors, especially in the hostile environment of the human body. The enormous potential for in vivo sensing of pathophysiological molecules over time and space has led to many attempts to achieve this and the rewards, both in terms of clinical benefit and improved understanding, cannot be underestimated. As new tools for producing biosensors become available, they are rapidly recruited. In recent years, developments in two areas of science and engineering have provided new opportunities to look again at how biosensors are built and deployed. These developments were not driven by the needs of those building and using biosensors but by much broader scientific and technological trends, which nonetheless have found ready applicability in this area.One of the trends is an increasing knowledge of the structural factors that determine function in biological macromolecules and the other is the appreciation that the properties of materials with a characteristic length scale from 1 to 100 nm are not those expected from dividing macroscopic materials into smaller pieces nor those expected from adding atoms or molecules together. The first of these trends is sometimes referred to as biomolecular engineering and the second as nanotechnology.There are many drivers for the use of molecular engineering and nanotechnology in the design and application of biosensors and the past decade has seen these tools

show abstract

Towards Nanowire (Bio) Sensors

Cited by 8 publications

References 23 publications

Diversity of anisotropy effects in the breakup of metallic FCC nanowires into ordered nanodroplet chains

Diversity of anisotropy effects in the breakup of metallic FCC nanowires into ordered nanodroplet chains

New Gold Nanostructures for Sensor Applications: A Review

Biosensor Design with Molecular Engineering and Nanotechnology

Contact Info

Product

Resources

About