Phase transition in ultrathin Bi films

Mitch, Michael G.; Chase, S. J.; Fortner, J.; Yu, R. Q.; Lannin, J. S.

doi:10.1103/physrevlett.67.875

Cited by 57 publications

(41 citation statements)

References 15 publications

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“…As shown in Fig. 1(b), the bands located at 69.1 and 95.4 cm -1 can be definitely attributed to the first-order scattering E g and A 1g modes of Bi [40][41][42][43]. The weaker and broader peaks located at about 126.9 and 183.8 cm -1 are the corresponding second-order Raman scattering peaks [42].…”

Section: Photocatalytic Testsmentioning

confidence: 83%

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

2011

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Composite Bi@Bi 2 O 3 microspheres have been synthesized via a microwave-assisted solvothermal route. The Bi@Bi 2 O 3 microspheres had a narrow size distribution in the range 1.2-2.8 mm. Glucose was selected as the reductant, BiCl 3 as the bismuth source, and ethylene glycol (EG) as the solvent in the synthesis system. The as-synthesized sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle diameter distribution, energy dispersive X-ray spectroscopy (EDS), ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence (PL) spectroscopy. The photocatalytic activities of the Bi@Bi 2 O 3 microspheres were evaluated by the photodegradation of rhodamine B (RhB) and methyl orange (MO) dyes under UV light irradiation. The degradation reached ~96.6% for RhB and 100% for MO after 4 h reaction in the presence of the as-synthesized Bi@Bi 2 O 3 microspheres.

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Section: Photocatalytic Testsmentioning

confidence: 83%

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

2011

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“…Raman-scattering measurements of clusters of bismuth exhibit a phase transition from rhombohedral Bi nanocrystalline to amorphous like clusters depending on cluster size [2]. They also suggest that amorphous clusters are semiconducting and covalent interactions increase with decreasing size.…”

Section: Introductionmentioning

confidence: 84%

EXAFS Study of the Local Structure for Semimetal-Semiconductor Transition in Bismuth Clusters

Ikemoto

Deto

Miyanaga

2005

e-J. Surf. Sci. Nanotechnol.

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Extended X-ray absorption fine structure (EXAFS) measurements were carried out in order to investigate the phase transition of bismuth clusters from semi-metallic nanocrystal to semiconducting amorphousness depending on the size. XAFS functions were Fourier-transformed and analyzed by the curve fitting method. The peaks around 3.0Å and 3.6Å are attributed to the nearest neighbors within the the layer and between the interlayer, respectively. In the 0.5 nm thick films the covalent bond length within the layer slightly shortens and the peak originated from the interlayer disappears.

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“…Below we argue that this crossover may be related to film growth models advanced by in situ Raman studies on quench condensed Bi, 21 and STM results obtained on quench condensed Au and Pb films.…”

Section: Amorphous To Granular Structural Transitionmentioning

confidence: 71%

Electrical transport studies of quench condensed Bi films at the initial stage of film growth: A structural transition and the possible formation of electron droplets

Rosario¹,

Liu²

2002

Phys. Rev. B

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The electrical transport properties of amorphous Bi films prepared by sequential quench deposition have been studied in situ. A superconductor-insulator (S-I) transition was observed as the film was made increasingly thicker, consistent with previous studies. Unexpected behavior was found at the initial stage of film growth, a regime not explored in detail prior to the present work. As the temperature was lowered, a positive temperature coefficient of resistance (dR/dT > 0) emerged, with the resistance reaching a minimum before the dR/dT became negative again. This behavior was accompanied by a non-linear and asymmetric I − V characteristic. As the film became thicker, conventional variable-range hopping (VRH) was recovered. We attribute the observed crossover in the electrical transport properties to an amorphous to granular structural transition. The positive dR/dT found in the amorphous phase of Bi formed at the initial stage of film growth was qualitatively explained by the formation of metallic droplets within the electron glass. 73.50.-h, 74.40.+k

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Phase transition in ultrathin Bi films

Cited by 57 publications

References 15 publications

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

EXAFS Study of the Local Structure for Semimetal-Semiconductor Transition in Bismuth Clusters

Electrical transport studies of quench condensed Bi films at the initial stage of film growth: A structural transition and the possible formation of electron droplets

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