Self-Assembled Nanowire−Nanoribbon Junction Arrays of ZnO

Gao, Pu‐Xian; Wang, Zhong Lin

doi:10.1021/jp0265485

Cited by 346 publications

(257 citation statements)

References 15 publications

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“…As a result, nanoribbons have a rectangular cross section. TEM studies on a wide nanoribbon ( Figure 2B) reveal similar crystalline characteristics to the narrow nanoribbon ( Figure 2A); it grows along [11][12][13][14][15][16][17][18][19][20] direction as well. The TEM data of a nanowire with rough surface are shown in Figure 2C.…”

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confidence: 78%

“…The corresponding selected-area electron diffraction (SAED) pattern (inset of Figure 2A) exhibits a clear hexagonally symmetric spots pattern, confirming the single crystalline nature. A high resolution TEM (HRTEM) image (inset in Figure 2A) shows hexagonal lattice fringes with a correct lattice spacing of 2.1 Å between (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) planes. SAED patterns and HRTEM images demonstrate that the nanoribbons grow along [11][12][13][14][15][16][17][18][19][20] direction, with (0001) facets as top and bottom surfaces and (1-100) facets as side surfaces.…”

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confidence: 99%

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Topological Insulator Nanowires and Nanoribbons

Kong¹,

Randel

Peng³

et al. 2009

Nano Lett.

313

334

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Recent theoretical calculations and photoemission spectroscopy measurements on the bulk Bi 2 Se 3 material show that it is a three-dimensional topological insulator possessing conductive surface states with nondegenerate spins, attractive for dissipationless electronics and spintronics applications. Nanoscale topological insulator materials have a large surface-to-volume ratio that can manifest the conductive surface states and are promising candidates for devices. Here we report the synthesis and characterization of high quality single crystalline Bi 2 Se 3 nanomaterials with a variety of morphologies. The synthesis of Bi 2 Se 3 nanowires and nanoribbons employs Au-catalyzed vapor-liquid-solid (VLS) mechanism. Nanowires, which exhibit rough surfaces, are formed by stacking nanoplatelets along the axial direction of the wires. Nanoribbons are grown along [11][12][13][14][15][16][17][18][19][20] direction with a rectangular crosssection and have diverse morphologies, including quasi-one-dimensional, sheetlike, zigzag and sawtooth shapes. Scanning tunneling microscopy (STM) studies on nanoribbons show atomically smooth surfaces with 1 nm step edges, indicating single Se-Bi-Se-Bi-Se quintuple layers. STM measurements reveal a honeycomb atomic lattice, suggesting that the STM tip couples not only to the top Se atomic layer, but also to the Bi atomic layer underneath, which opens up the possibility to investigate the contribution of different atomic orbitals to the topological surface states. Transport measurements of a single nanoribbon device (four terminal resistance and Hall resistance) show great promise for nanoribbons as candidates to study topological surface states.Bi 2 Se 3 is a narrow gap semiconductor, previously studied for infrared detectors and thermoelectric applications. 1 Recently, research on Bi2Se3 and related compounds (Bi2Te3 and Sb2Te3) has attracted much interest because they are predicted to be three-dimensional (3D) topological insulators (TIs), a new class of quantum matter possessing conducting surface states with nondegenerate spins. 2 In TIs, the strong spin-orbit coupling dictates robust, nontrivial surface states, which are topologically protected against back scattering from time-reversal invariant defects and impurities. Angleresolved photoemission spectroscopy (ARPES) measurements on bulk single crystals of BixSb1-x, Bi2Se3, and Bi2Te3 have verified the existence of the 3D TI phase. [3][4][5][6][7] In particular, the surface states of Bi2Se3 forms a single Dirac cone inside a large bulk band gap of 0.3 eV, thus being suggested as the reference material for the 3D TIs. 2,4,8 The unique properties of the Bi2Se3 TI may pave the way for dissipationless quantum electronics and room temperature spintronics applications.1 To date, the surface properties of the 3D TIs have been mainly investigated by ARPES measurements on the cleaved surface of bulk crystals. [3][4][5][6][7] Single crystalline nanostructure, on the other hand, offers an attractive alternative system to study the surface sta...

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confidence: 78%

mentioning

confidence: 99%

Topological Insulator Nanowires and Nanoribbons

Kong¹,

Randel

Peng³

et al. 2009

Nano Lett.

313

334

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“…Zig-zig or kinked nanowire structures have also been fabricated (Figure 5b) [68]. Other researches have created ribbons coated with perpendicular branching structures that look like holiday tinsel (Figure 5c) [69]. Figure 5.…”

Section: Step Fourmentioning

confidence: 99%

“…Existing nanowire morphologies, (a) spiral, spring, comb, ring, propellers, helix, saw, bows, tetrapoles, (b) zig-zig or kinked, (c) tinsel. (adapted from: (a) [61,67], (b) [68], (c) [69]). …”

Section: Step Fourmentioning

confidence: 99%

Guard Cell and Tropomyosin Inspired Chemical Sensor

Nagel

2013

Micromachines

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Abstract:Sensors are an integral part of many engineered products and systems. Biological inspiration has the potential to improve current sensor designs as well as inspire innovative ones. This paper presents the design of an innovative, biologically-inspired chemical sensor that performs "up-front" processing through mechanical means. Inspiration from the physiology (function) of the guard cell coupled with the morphology (form) and physiology of tropomyosin resulted in two concept variants for the chemical sensor. Applications of the sensor design include environmental monitoring of harmful gases, and a non-invasive approach to detect illnesses including diabetes, liver disease, and cancer on the breath.

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“…Homogeneous structures of SnO 2 /SnO 2 have also been produced by a multistep thermal vapor deposition procedure [18], while nanowire-nanoribbon junction arrays of ZnO have been produced through a vapor-liquid-solid process [19]. In this field, we recently introduced Co 3 O 4 -ZnO hierarchical structure, which performed well when utilized as catalyst in degradation of rhodamine B dye [20].…”

Section: Introductionmentioning

confidence: 99%