Site-specific nucleation and controlled growth of a vertical tellurium nanowire array for high performance field emitters

Safdar, Muhammad; Zhan, Xueying; Niu, Mu; Mirza, Misbah; Zhao, Qing; Wang, Zhenxing; Zhang, Jinping; Sun, Lianfeng; He, Jun

doi:10.1088/0957-4484/24/18/185705

Cited by 52 publications

(44 citation statements)

References 37 publications

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“…26,47,49 The broad bands at 268.9 and 265.2 cm -1 for S-Te NWs and L-Te NWs, respectively, are related to the second order harmonic of the E mode of tellurium. 42,48,50 Notice that the Raman bands for L-Te NWs are slightly shifted to lower energy values in comparison to S-Te NWs. Analogous results were presented in Yu and co-workers 25 and Li et al 30 Additionally, the relative intensity of the A 1 mode of L-Te NWs is smaller than the one displayed for S-Te NWs.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Tellurium Nanowires and Study of Their Third-Order Nonlinear Optical Properties

Silva

Mejía

Ribeiro

et al. 2016

Journal of the Brazilian Chemical Society

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We report on the synthesis of single-crystalline tellurium nanowires with different aspectratios prepared via facile surfactant-assisted synthesis under mild conditions. Short and long Te nanowires were synthesized by the reduction of tellurium dioxide by hypophosphorous acid with the assistance of polyoxyethylene (23) laurylether and cetyltrimethylammonium bromide, respectively. We obtained uniform single-crystal Te nanowires with diameter below 30 nm and tunable length from 600 nm to 5 µm. Short and long Te nanowires showed remarkable nonlinear absorption and their third-order nonlinear optical properties were investigated by the Z-scan technique with single 80 ps laser pulses at 532 nm. For the first time, it was observed a distinguished switching behavior from saturated absorption to reverse saturated absorption as a function of the laser intensity in one-dimensional Te nanostructures. Although both short and long Te nanowires display such interesting behavior, the short ones exhibited superior optical limiting performance.

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Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Tellurium Nanowires and Study of Their Third-Order Nonlinear Optical Properties

Silva

Mejía

Ribeiro

et al. 2016

Journal of the Brazilian Chemical Society

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“…All corresponding peaks for the Te products are sharp and well defined indicating that a pure phase crystalline was formed. Compared to other peaks, the relatively intensive (101) peak, strong reflection peak of (h00), and weak reflection peaks of (l10) and (k10) indicate the preferred growth of Te nanomaterials [26][27][28]. Further, the intrinsic vibration information of Te nanosheets is quantitatively recorded by Raman spectroscopy in Figure 1(d).…”

Section: Resultsmentioning

confidence: 98%

One-Pot Hydrothermal Synthesis of Thin Tellurene Nanosheet and Its Formation Mechanism

Gao

Wang

Hong

et al. 2019

Journal of Nanomaterials

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Two-dimensional thin tellurene (Te) was effectively synthesized by a one-pot hydrothermal reduction process. It had the hexagonal phase with good crystallization, the extent of radiation absorption (400-850 nm), and a 1.37 eV band gap. Based on the evolution of the crystal structure and morphology, the formation mechanism of Te nanomaterials has been speculated by the time-dependent reactions as the nucleation of nanosized clusters first, then self-assembly into uniform nanowires, and, finally, formation into the nanosheets in the presence of polyvinylpyrrolidone (PVP). It is expected that thin Te nanosheets can further be used in the field of photoelectric applications.

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“…Experimental methods for the synthesis of 1-D tellurium have been well researched and are categorized into either vapor phase or solution phase processes [28][29] . Conversely, the synthesis of 2-D tellurium (Te) is not well established.…”

Section: Synthesis Of Tellurenementioning

confidence: 99%

Alloying of Alkali Metals with Tellurene

Jain

Yuan

Singh

et al. 2020

Preprint

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Graphite is ubiquitous as the anode material in lithium-ion batteries, but offers relatively low volumetric capacity (330 to 430 mAh cm-3). By contrast, Tellurene (Te) is expected to alloy with alkali metals with high volumetric capacity (~2620 mAh cm-3), but to date there is no detailed study on its alloying behavior. In this work, we have investigated the alloying response of a range of alkali metals (A = Li, Na or K) with few-layer Te. In-situ transmission electron microscopy and density functional theory both indicate that Te alloys with alkali metals forming A2Te. However, the crystalline order of alloyed products varied significantly from single-crystal (for Li2Te) to polycrystalline (for Na2Te and K2Te). It is well established that typical alloying materials (e.g., silicon, tin, black phosphorous) lose their crystallinity when reacted with Li. The ability of Te to retain its crystallinity is therefore surprising. Nudged elastic band calculations and ab-initio molecular dynamics simulations reveal that compared to Na or K, the migration of Li is highly “isotropic” in Te, enabling its crystallinity to be preserved. Such isotropic Li transport is made possible by Te’s peculiar structure comprised of chiral chains bound by van der Waals forces. To evaluate the electrochemical performance of Te, we tested Te electrodes in half-cells vs Li/Na/K metal. While alloying with Na and K showed poor performance, with Li, the Te electrode exhibited a volumetric capacity of ~700 mAh cm-3, which is about two-times the practical capacity of commercial graphite. Such Te based batteries could play an important role in applications where high volumetric energy and power density are of paramount importance.

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Site-specific nucleation and controlled growth of a vertical tellurium nanowire array for high performance field emitters

Cited by 52 publications

References 37 publications

Facile Synthesis of Tellurium Nanowires and Study of Their Third-Order Nonlinear Optical Properties

Facile Synthesis of Tellurium Nanowires and Study of Their Third-Order Nonlinear Optical Properties

One-Pot Hydrothermal Synthesis of Thin Tellurene Nanosheet and Its Formation Mechanism

Alloying of Alkali Metals with Tellurene

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