Photoemission study of dissociatively adsorbed methane on a pre-oxidized SnO2 thin film

Kawabe, Taketoshi; Shimomura, Satoshi; Karasuda, Takashi; Tabata, Kenji; Suzuki, Eiji; Yamaguchi, Yoichi

doi:10.1016/s0039-6028(99)00997-8

Cited by 74 publications

(38 citation statements)

References 25 publications

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“…The main peak at 529.5 eV most likely corresponds to O 2 in the iron oxide lattice. The second broad feature is shifted by about 2 eV to higher binding energy and can be attributed to OH or adsorbed oxygen [26]. Thus, the XPS analysis confi rmed the formation of a Fe 2 O 3 phase.…”

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confidence: 71%

Simple and rapid synthesis of α-Fe2O3 nanowires under ambient conditions

Nasibulin¹,

Račkauskas²,

Jiang³

et al. 2009

Nano Res.

216

131

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We propose a simple method for the efficient and rapid synthesis of one-dimensional hematite ( Fe 2 O 3 ) nanostructures based on electrical resistive heating of iron wire under ambient conditions. Typically, 1-5 μm long -Fe 2 O 3 nanowires were synthesized on a time scale of seconds at temperatures of around 700 °C . The morphology, structure, and mechanism of formation of the nanowires were studied by scanning and transmission electron microscopies, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and Raman techniques. A nanowire growth mechanism based on diffusion of iron ions to the surface through grain boundaries and to the growing wire tip through stacking fault defects and due to surface diffusion is proposed. In addition, -Fe 2 O 3 has many other uses including in nonlinear optics, gas sensors, and as a pigment [13 15]. The growth of -Fe 2 O 3 nanowires (NWs) has been carried out mainly on pure iron foils/plates or powder in a heated and well-controlled environment, i.e., at a certain partial pressure of particular gases or under vacuum conditions [13, 16 22]. Typical time required for the synthesis of a dense NW "forest" by oxidation of pure iron range from hours to a few tens KEYWORDS Nano Research 374Nano Res (2009) 2: 373 379 of hours. Recently, a new way of rapid NW synthesis by direct plasma oxidation of bulk materials was proposed [23,24]. However, this method is complicated, since it requires both vacuum conditions and equipment to create plasma under controlled conditions. Here, we propose a very simple method, which does not require any complicated equipment or a controlled atmosphere, since the synthesis can be carried out using a basic DC power supply (such as a car battery or a set of household batteries) under ambient conditions; the process of NW formation is very rapid, with a typical growth time of a few seconds, and with a very little energy consumption. The method is described in detail in the Electronic Supplementary Material (ESM).In spite of intensive research into one-dimensional structures of metal oxides in particular and NWs in general, our understanding of the mechanisms of their formation and growth is still incomplete. Our method affords the possibility to investigation the NW growth. The morphology, structure, and nanowire formation were examined by scanning and transmission electron microscopies (SEM and TEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and Raman techniques.Iron oxide NWs were grown by resistive heating of iron wire (99.99% and 99.5%, Goodfellow) with a diameter of 0.25 mm under ambient laboratory conditions. The growth was carried out by applying a potential difference of 2.7 7.8 V (with a current of 2.5 2.6 A) to 5.8 15.0 cm long Fe wires. It is important to note that the synthesis can be easily controlled by observing the color of the wire and by varying the applied heating power (see the ESM). SEM observation of the wire after the synthesis of the reddish material revealed that the...

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mentioning

confidence: 71%

Simple and rapid synthesis of α-Fe2O3 nanowires under ambient conditions

Nasibulin¹,

Račkauskas²,

Jiang³

et al. 2009

Nano Res.

216

131

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“…1c and d show the Sn 3d and O 1s XPS spectra of the SnO 2 NBs. For the O 1s XPS spectrum, the strong peak at low binding energy side and weak shoulder at high energy side are attributed to the oxygen in the SnO 2 lattice and the adsorbed oxygen [32,33]. Fig.…”

Section: Experimental and First-principles Calculation Detailmentioning

confidence: 93%

Recovering near-band-edge ultraviolet responses in a wide-bandgap oxide with dipole-forbidden bandgap transition

Deng

et al. 2015

Journal of Alloys and Compounds

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“…The thickness of the lms was measured using a prolometer (KLA Tencor P-6). 3. Results and discussions FESEM micrographs of SnO 2 :Sb thin lms deposited with various RF powers at 10% oxygen partial pressure were presented in Fig.…”

Section: Methodsmentioning

confidence: 99%

Effects of RF Power on Electrical and Structural Properties of Sputtered SnO₂:Sb Thin Films

et al. 2014

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In this work, antimony doped tin oxide (SnO2:Sb) thin lms were fabricated using a radio frequency magnetron sputtering system on Si wafer and glass substrates. The base pressure in the sputtering chamber was 1.0 Pa. The SnO2:Sb thin lms were deposited for 1.0 h in a mixture of Ar and O2 environment with O2/Ar ratio of 10/90 at 75, 100, and 125 W RF sputtering powers. The microstructure of SnO2:Sb thin lms was assessed using a eld emission scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diraction. The average surface roughness (Ra) was measured with atomic force microscopy. The electrical resistivity of the deposited lms was measured by the four-point-probe method. The thicknesses of the lms were measured by surface proler.

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Photoemission study of dissociatively adsorbed methane on a pre-oxidized SnO2 thin film

Cited by 74 publications

References 25 publications

Simple and rapid synthesis of α-Fe2O3 nanowires under ambient conditions

Simple and rapid synthesis of α-Fe2O3 nanowires under ambient conditions

Recovering near-band-edge ultraviolet responses in a wide-bandgap oxide with dipole-forbidden bandgap transition

Effects of RF Power on Electrical and Structural Properties of Sputtered SnO₂:Sb Thin Films

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Photoemission study of dissociatively adsorbed methane on a pre-oxidized SnO2 thin film

Cited by 74 publications

References 25 publications

Simple and rapid synthesis of α-Fe2O3 nanowires under ambient conditions

Simple and rapid synthesis of α-Fe2O3 nanowires under ambient conditions

Recovering near-band-edge ultraviolet responses in a wide-bandgap oxide with dipole-forbidden bandgap transition

Effects of RF Power on Electrical and Structural Properties of Sputtered SnO2:Sb Thin Films

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Effects of RF Power on Electrical and Structural Properties of Sputtered SnO₂:Sb Thin Films