Electrochemical Template Synthesis of Multisegment Nanowires:  Fabrication and Protein Functionalization

Wildt, Bridget; Mali, Prashant; Searson, Peter C.

doi:10.1021/la061184j

Cited by 46 publications

(44 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, based on the pioneering work of Martin and Searson [142], and later by Mallouk [141] and Gösele [144], a vast variety of metal nanowires have been successfully deposited in PAA templates including: Pt [176], Ag [177], Au [178], Co [179], Cu [180], Ni [144,178,181], Pb [182], and Pd [183]. In addition multi-segment nanowires including; Au/Ni/Au [184] and Co/Cu [172] have been reported. Both binary and ternary alloy nanowire arrays of; CoCr [185], CoPt [186], FePt [186], FePd [187], NiCo [188], Ni 5 Zn 21 [171] , and FeCoNi [189] have also been fabricated.…”

Section: Metals Within Paa Mtfs and Bcps Templatesmentioning

confidence: 99%

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Farrell

Petkov²,

Morris

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Self-assembled nanoscale porous architectures, such as mesoporous silica films (MPS), block copolymer films (BCP) and porous anodic aluminas (PAAs), are ideal hosts for templating one dimension (1 D) nano-entities for a wide range of electronic, photonic, magnetic and environmental applications. All three templates offer dimensional scalability and tunability over a wide range, with critical pore sizes for each system well below the 20 nm threshold [1][2][3]. Recently, research has progressed towards controlling the pore direction, orientation and long range order of these nanostructures through so called directed self-assembly (DSA). Significantly, the introduction of a wide range of top-down chemically and physically pre-patterning substrates has facilitated the DSA of nanostructures into functional device arrays. The following review begins with an overview of the fundamental aspects of self-assembly and ordering processes during the formation of PAAs, BCPs and MPS films. Special attention is given to the different ways of directing self-assembly, concentrating on properties such as uni-directional alignment, precision placement and registry of the self-assembled structures to hierarchal or top down architectures. Finally, to distinguish this review from other articles we focus on research where nanostructures have been utilised in part to fabricate arrays of functioning devices below the sub 50 nm threshold, by subtractive transfer and additive methods. Where possible, we attempt to compare and contrast the different templating approaches and highlight the strengths and/or limitations that will be important for their potential integration into downstream processes. ACCEPTED MANUSCRIPT 3 SECTION 1.0: SELF ASSEMBLY AND NANO-ARCHITETCURESThe diversity of self-assembled nanostructures and more importantly, their precise orientation within a thin film (fixed to a substrate) ultimately determines their function and overall application. A large population of research reports to date have focused on identifying these orientations and related periodicities, using x-ray and microscopy tools, as well the development of methods for readily manipulating nanostructures, such as pre-patterning of silicon substrates for the alignment of block copolymers (BCPs) [4] and mesoporous thin films (MTFs) [5] and altering the growth direction of porous anodic alumina (PAA) templates [6]. In this section, a brief synopsis of the mechanisms behind the self-assembly/organisation of each system and highlight nanoscale architectures (and orientations), which are important from a device perspective. Templated mesoporous thin filmsOrdered mesoporous powders were first discovered by researchers at the Mobil Petrochemical Corporation in 1992 and shortly after, sol-gel derived mesoporous silica films were fabricated [1,7].The first series of ordered mesoporous films were reported by Yang et al. in 1996 [8], prepared using initial surfactant concentrations above their critical micelle concentration (CMC). However the films prepared fil...

show abstract

Section: Metals Within Paa Mtfs and Bcps Templatesmentioning

confidence: 99%

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Farrell

Petkov²,

Morris

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

show abstract

“…Nanorods have the capacity for large variations in composition. In addition, their properties have been exploited and designed for specific biological applications by taking advantage of the additional degrees of freedom associated with nanorods in comparison to spherical particles (4). In recent years, there has been an escalation in the development of techniques for synthesis of multicomponent nanorods and subsequent surface functionalization.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Nanorods for Biomedical Applications

2007

View full text Add to dashboard Cite

Multifunctional nanorods have shown significant potential in a wide range of biomedical applications. Nanorods can be synthesized by a top down or bottom-up approach. The bottom-up approach commonly utilizes a template deposition methodology. A variety of metal segments can easily be incorporated into the nanorods. This permits high degrees of chemical and dimensional control. High aspect-ratio nanorods have a large surface area for functionalization. By varying the metal segments in the nanorods, spatial control over the binding of functional biomolecules that correspond with the unique surface chemistry of the metal segment can be achieved. Functionalized multicomponent nanorods are utilized in applications ranging from multiplexing, protein sensing, glucose sensing, imaging, biomolecule-associated nanocircuits, gene delivery and vaccinations.

show abstract

“…And specific functionality including optical, magnetic, or electrical properties could be introduced. Multisegment metallic nanowires synthesized by electrochemistry have been assembled endto-end by using different linkages, such as biomolecules [15][16][17][18] and polymers. 19 Nanowires capped with magnetic metal ends have been aligned between magnetic electrodes.…”

mentioning

confidence: 99%

Multisegment Nanowire Sensors for the Detection of DNA Molecules

2008

View full text Add to dashboard Cite

We describe a novel application for detecting specific single strand DNA sequences using multisegment nanowires via a straightforward surface functionalization method. Nanowires comprising CdTe−Au−CdTe segments are fabricated using electrochemical deposition, and electrical characterization indicates a p-type behavior for the multisegment nanostructures, in a back-to-back Schottky diode configuration. Such nanostructures modified with thiol-terminated probe DNA fragments could function as high fidelity sensors for biomolecules at very low concentration. The gold segment is utilized for functionalization and binding of single strand DNA (ssDNA) fragments while the CdTe segments at both ends serve to modulate the equilibrium Fermi level of the heterojunction device upon hybridization of the complementary DNA fragments (cDNA) to the ssDNA over the Au segment. Employing such multisegment nanowires could lead to the fabrication more sophisticated and high multispecificity biosensors via selective functionalization of individual segments for biowarfare sensing and medical diagnostics applications.Nanowire-based field-effect transistors (FET) have been widely used for detection of a variety of biological and chemical species, detection of PH value, detection of metal ions, viruses, proteins, etc. [1][2][3][4] In most of these applications, the mechanism of sensing is based on the functionalization of a homogeneous semiconducting nanowire, such as silicon 4 and In 2 O 3 nanowires. 5 There is a growing interest in fabricating heterojunction nanowires, which show great potential for applications in nanoelectronics, 6 energy conversion, 7 self-assembly, 8 and controlled positioning of nanowire arrays. 9 Generally, there are two basic morphologies in nanowire heterostructures: radial heterostructures, such as core-shell nanowires, and axial heterostructures, comprising multisegment nanowires. Core-shell nanowires have been used to fabricate coaxially gated nanowire transistors. 10,11 Multisegment nanowires comprise several different material compositions or phases along its length, and their synthesis have been demonstrated in a variety of configurations including the growth of nanowire superlattices via alternating laser ablation of different solid targets. The superlattices inside the nanowires make them engineered materials having a high thermoelectric coefficient, 12 possible uses in p-n junction diodes, 13 and with notable optical properties via photoluminescence characterization. 14 Electrochemical template synthesis is a versatile technique for producing multisegment nanowires, in which individual segments could be metallic, oxide, binary, or ternary alloys and semiconducting and conducting polymers. And specific functionality including optical, magnetic, or electrical properties could be introduced. Multisegment metallic nanowires synthesized by electrochemistry have been assembled endto-end by using different linkages, such as biomolecules [15][16][17][18] and polymers. 19 Nanowires capped with magnetic met...

show abstract

Electrochemical Template Synthesis of Multisegment Nanowires: Fabrication and Protein Functionalization

Cited by 46 publications

References 43 publications

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Self-assembled templates for the generation of arrays of 1-dimensional nanostructures: From molecules to devices

Multifunctional Nanorods for Biomedical Applications

Multisegment Nanowire Sensors for the Detection of DNA Molecules

Contact Info

Product

Resources

About