Abstract
Nanowires are highly attractive for advanced nanoelectronics and nanoscience applications, due to its novel properties such as increased surface area, large aspect ratio, and increased surface scattering of electrons and phonons. The design and fabrication of nanowires array provide a great platform to overcome the challenges/limitation of its counter partner. This chapter focuses on the synthesis of metal oxide nanowire and axial heterostructure nanowire array using the Glancing angle deposition (GLAD) technique. The structural, optical and electrical properties are studied. This GLAD technique offers control over one-dimensional (1D) nanostructure growth with self-alignment capability. It is also reviewed in an effort to cover the various application in this area of optoelectronic devices and wettability applications that had been synthesized using GLAD.
Highlights
Low-dimensional nanostructures such as zero-dimensional (0D), one-dimensional (1D) and two-dimensional (2D) have attracted enormous attention from three-dimensional or bulk structure due to the novel physical and chemical properties caused by size and quantum effects
The silicon (Si) substrate is subjected to a 3-step cleaning process using electronic grade acetone, methanol, and deionized (DI) water, and an array of nanowires is synthesized on the Si substrate
The top metal contact electrode is synthesized on the nanowire arrays through an Al mask with a hole diameter ~1 mm and ITO, which is used as the back-contact electrode
Summary
Low-dimensional nanostructures such as zero-dimensional (0D), one-dimensional (1D) and two-dimensional (2D) have attracted enormous attention from three-dimensional or bulk structure due to the novel physical and chemical properties caused by size and quantum effects. Nanowires (NWs) are 1D nanostructures with a large aspect ratio (length/diameter), with diameters in the 1–200 nm scale and lengths ranging from some hundreds of nanometers up to several tens of micrometer Owing to their nanoscale dimensions, they have size confinement effects, which give them novel properties as compared to the bulk materials. The tilting of the nanocolumn structure found in OAD is mitigated primarily to the rotation of the substrate, which cancels out the lateral component of the incident vapor flux during the deposition process. TEM image of TiO2 provide information on the geometry of the nanowires at nanoscale along with growth direction as shown in inset Figure 5(c)
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