Orthorhombic Pbcn SnO2 nanowires for gas sensing applications

Arbiol, Jordi; Comini, Elisabetta; Faglia, Guido; Sberveglieri, Giorgio; Morante, J.R.

doi:10.1016/j.jcrysgro.2007.10.024

Cited by 48 publications

(34 citation statements)

References 24 publications

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“…[1][2][3][4][5] One of the consequences related to the large surface-to-volume ratio is the crystallization of nanowires in crystalline structures that are not stable in the bulk form. [6][7][8][9][10][11] In the case of nanowires pertaining to the arsenides and phosphides, it is very common to find rotational twins along with polytypism between wurtzite and zinc-blende structures. Wurtzite is not stable in the bulk form of these compounds.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy of wurtzite and zinc-blende GaAs nanowires: Polarization dependence, selection rules, and strain effects

et al. 2009

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Polarization-dependent Raman scattering experiments realized on single GaAs nanowires with different percentages of zinc-blende and wurtzite structure are presented. The selection rules for the special case of nanowires are found and discussed. In the case of zinc-blende, the transversal optical mode E 1 ͑TO͒ at 267 cm −1 exhibits the highest intensity when the incident and analyzed polarization are parallel to the nanowire axis. This is a consequence of the nanowire geometry and dielectric mismatch with the environment, and in quite good agreement with the Raman selection rules. We also find a consistent splitting of 1 cm −1 of the E 1 ͑TO͒. The transversal optical mode related to the wurtzite structure, E 2 H , is measured between 254 and 256 cm −1 , depending on the wurtzite content. The azimuthal dependence of E 2 H indicates that the mode is excited with the highest efficiency when the incident and analyzed polarization are perpendicular to the nanowire axis, in agreement with the selection rules. The presence of strain between wurtzite and zinc-blende is analyzed by the relative shift of the E 1 ͑TO͒ and E 2 H modes. Finally, the influence of the surface roughness in the intensity of the longitudinal optical mode on ͕110͖ facets is presented.

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Section: Introductionmentioning

confidence: 99%

Raman spectroscopy of wurtzite and zinc-blende GaAs nanowires: Polarization dependence, selection rules, and strain effects

et al. 2009

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“…[1][2][3][4][5][6][7][8][9] In contrast with the number of theoretical studies on transport phenomena in nanostructures, experimental investigations on the correspondence between transport mechanisms and their structural properties at the nanoscale have been scarcely reported. A detailed knowledge of the structure becomes increasingly important when solids are reduced to the nanometer range.…”

Section: Introductionmentioning

confidence: 99%

Influence of the (111) twinning on the formation of diamond cubic/diamond hexagonal heterostructures in Cu-catalyzed Si nanowires

Arbiol

Morral

Estradé

et al. 2008

Journal of Applied Physics

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The occurrence of heterostructures of cubic silicon/hexagonal silicon as disks defined along the nanowire ͗111͘ growth direction is reviewed in detail for Si nanowires obtained using Cu as catalyst. Detailed measurements on the structural properties of both semiconductor phases and their interface are presented. We observe that during growth, lamellar twinning on the cubic phase along the ͗111͘ direction is generated. Consecutive presence of twins along the ͗111͘ growth direction was found to be correlated with the origin of the local formation of the hexagonal Si segments along the nanowires, which define quantum wells of hexagonal Si diamond. Finally, we evaluate and comment on the consequences of the twins and wurtzite in the final electronic properties of the wires with the help of the predicted energy band diagram.

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“…Specifically, because SnO 2 exhibits high sensitivity for detecting CO and NO x gases, vigorous studies on SnO 2 -based gas sensors have been undertaken (Watson et al, 1993). In these studies, SnO 2 in orthorhombic structures was found to exhibit better sensitivity for specific gases than the tetragonal rutiletype structure (Arbiol et al, 2008;Sangaletti et al, 1997). However, natural SnO 2 , known as cassiterite, always exists as the rutile-type structure and it is generally difficult to obtain the orthorhombic phase directly from minerals (Chen et al, 2006).…”

Section: Sno 2 Nanobelts and Nanowires Under High Pressuresmentioning

confidence: 99%

“…Our findings indicate that certain structures and/or phases can be switched 'on' or 'off' at selected pressure regions with selected morphologies via selected paths. Applying pressure to nanomaterials with different morphologies, therefore, has profound implications for producing controlled structures with desirable properties, such as those for gas sensors whose sensitivity has a preferential correlation to the orthorhombic -PbO 2 -type structure of SnO 2 (Arbiol et al, 2008). However, detailed transformation mechanisms, especially the origins of the surprising reversibility and metastability require further theoretical investigation.…”

Section: Wwwintechopencommentioning

confidence: 99%

Novel Pressure-Induced Structural Transformations of Inorganic Nanowires

Song¹

2011

Nanowires - Fundamental Research

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Orthorhombic Pbcn SnO2 nanowires for gas sensing applications

Cited by 48 publications

References 24 publications

Raman spectroscopy of wurtzite and zinc-blende GaAs nanowires: Polarization dependence, selection rules, and strain effects

Raman spectroscopy of wurtzite and zinc-blende GaAs nanowires: Polarization dependence, selection rules, and strain effects

Influence of the (111) twinning on the formation of diamond cubic/diamond hexagonal heterostructures in Cu-catalyzed Si nanowires

Novel Pressure-Induced Structural Transformations of Inorganic Nanowires

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