Synthesis, characterization and optical properties of flower-like tellurium

Wang, Shun; Guan, Weipeng; Ma, Dekun; Chen, Xian; Wan, Li; Huang, Shaoming; Wang, Jichang

doi:10.1039/b905053c

Cited by 41 publications

(29 citation statements)

References 56 publications

(47 reference statements)

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“…While a thicket-like Te crystal obtained form pH = 11 alkaline solution was consisted of some needle-like nanorods just as that reported in literature. 9 Fig. 2 illustrates the diffraction patterns of three kinds dendritic Te crystals; all the peaks can be well indexed to the pure hexagonal phase.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Dendritic Te Crystals by Electrodeposition: Growth Mechanism Study

Zhang

Wang

2015

J. Electrochem. Soc.

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Two kinds of dendritic Te crystals were successfully prepared by electrodepositing TeO 2 in pH = 3, 8 and 11 solutions respectively. The parameter of pH played an important role in growth rate. Moreover, the nucleation of Te in pH = 3 and 8 solutions were conformed to progressive type while in pH = 11 solution was conformed to instantaneous type. By systematically studying the morphologies evolution of Te crystals with different deposition times in pH = 3, 8 and 11 solutions, the structure of crystal was confirmed directly decided by nucleation type. Base on this, a growth mechanism for two kinds of dendritic crystals was proposed. Moreover, this mechanism may provide a reference for predicting the morphology of Te crystals in electrodeposition process.Electrodeposition of an element on a foreign substrate involving two processes: the nucleation of a new solid phase and its subsequent growth. The nucleation process can directly influence the morphology of deposit, and the morphology decided the physico-chemical properties of deposit. However, how the nucleation influence the morphology of deposit is rarely studied in previous studies. Te is an important element semiconductor with high anisotropy properties which means its morphology would be highly depend on nucleation state and growth rate. However, to date, Te is rarely prepared by electrodeposition technique and the nucleation in deposition process is rarely studied as well. Streltsov and his coworker studied the nucleation of TeO 2 deposit on n-and p-Si (100) wafers respectively, but the influence of nucleation to final morphology is not involved. 1 In this work, TeO 2 was deposited on polyimide/reduced graphene oxide electrode (PI/rGO). According to a series study of nucleation and morphology of Te in different pH solutions, we have an initial comprehension of how nucleation influences the morphology of deposit. Moreover, the active site of PI/rGO electrode is the exposed rGO, therefore, the nucleation of Te on PI/rGO electrode could be seen as the nucleation of Te on rGO film. In recent years, graphene and its derivative have been wide employed to modify electrode, so this study may offer a reference for nucleation on graphene material.In this work, two kinds of dendritic Te crystals were obtained. Among various nanostructures, material with dendritic shape has attracted more and more attentions for its special nanostructure offering material many potential applications in catalytic, biosensor and so on. 2,3 Te is a p-type semiconductor has potential applications in electric/optical devices, thermoelectric devices, gas sensor and so on. 4,5 For the highly anisotropic property, Te crystals has numerous structures. 6,7 To date, almost all Te crystals with dendritic structure were prepared by hydrothermal method. 8-10 However, in hydrothermal method various surfactants were added which always with poisonousness. Therefore, fabricating dendritic Te crystal by an environment friendly electrochemistry method is an interesting topic. It is well known that nanostru...

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Section: Resultsmentioning

confidence: 99%

Preparation of Dendritic Te Crystals by Electrodeposition: Growth Mechanism Study

Zhang

Wang

2015

J. Electrochem. Soc.

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“…The first report on PL property of Te nanostructure so far as we know indicates strong peaks at about 410, 433, and 452 nm [18]. After that, great interest and discussion have been given on the blue-violet PL of Te nanostructures due to their strong application back ground as optoelectric devices [19][20][21][22][23][24][25]. To the best of our knowledge, only the works by Wang et al [25] and Lin et al [26] have discussed on the origination mechanism of the PL.…”

Section: Introductionmentioning

confidence: 92%

Te hexagonal nanotubes: formation and optical properties

et al. 2016

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Hexagonal Te nanotubes have been synthesized via hydrothermal method. To demonstrate the formation mechanism, the effect of experimental parameters, such as concentration, surfactant, reducing agent, and reaction time, has been investigated. It is found the Te-tubular nanostructure in our experiments is the result of synergistic effect of surfactant, reducing agent, and reaction agent. Further investigation on the photoluminescence (PL) of the Te nanotubes indicates a broad PL peak at about 532 nm (2.33 eV), which is about 6.6 times over its bandgap (0.32 eV). By analyzing the temperature-related Raman spectra, the PL peak has been tentatively ascribed to the surface oxygen-related defect of the Te nanotubes.

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“…9d) in length, and from 10 ± 3 nm to 40 ± 5 nm in diameter, indicating that the SNRs just became bigger as the redox reaction proceeded. 12,40,41 The evolution mechanism was as follows: the Te and Se atoms were formed as Te-Se bonded helical chains, 11 these disorganized chains aggregated as amorphous Te/Se (a-Te/Se) at the initial moment, then the a-Te/Se (disorganized chains) transformed into trigonal Te/Se (organized chains) because of Rayleigh instability. 21 Fig .…”

Section: Morphologies Of T-te/se Anrsmentioning

confidence: 99%

One-step synthesis of high-quality homogenous Te/Se alloy nanorods with various morphologies

Cai

et al. 2015

CrystEngComm

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A convenient method was developed for controllable synthesis of homogeneous trigonal Te/Se alloy nanorods (t-Te/Se ANRs) with diverse morphologies, aspect ratios and compositions at room temperature in aqueous solution. These alloy nanorods were formed by a self-seeding process. By varying the molar ratio of TeO 2 to H 2 SeO 3 ĲxĲTe : Se)) in the initial precursors, the morphology of t-Te/Se ANRs was transformed mainly via two paths: formation of tri-fold nanorods (TNRs) or single nanorods (SNRs). The nanostructures of TNRs were generated only by using xĲTe : Se) ranging from 30 : 1 to 10 : 1, and SNRs were formed using xĲTe : Se) ranging from 200 : 1 to 100 : 1 or 2 : 1 to 1 : 1. The microstructures, compositions, and growth mechanisms of these nanorods were also analyzed in detail. Experimental section MaterialsTellurium dioxide (TeO 2 , Aladdin, 99.99%), selenious acid ĲH 2 SeO 3 , Aladdin, 99.99%), sodium dodecyl sulfate (SDS, Aldrich, 99.99%) and hydrazine monohydrate ĲN 2 H 4 ĴH 2 O, Sinopharm, 85%, AR) were used as-purchased. 18 MΩ cm CrystEngComm, 2015, 17, 3243-3250 | 3243 This journal is

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Synthesis, characterization and optical properties of flower-like tellurium

Cited by 41 publications

References 56 publications

Preparation of Dendritic Te Crystals by Electrodeposition: Growth Mechanism Study

Preparation of Dendritic Te Crystals by Electrodeposition: Growth Mechanism Study

Te hexagonal nanotubes: formation and optical properties

One-step synthesis of high-quality homogenous Te/Se alloy nanorods with various morphologies

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