Raman silent modes in vertically aligned undoped ZnO nanorods
We report the observation of Raman silent modes of B1low (276cm−1) and B1high (582cm−1) in vertically aligned ZnO nanorods due to the breakdown of translational symmetry. The structural studies reveal the high crystalline nature of the ZnO nanorods on the lattice mismatched silicon substrates. The d...
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| Veröffentlicht in: | Physica. B, Condensed matter Condensed matter, 2016-01, Vol.481, p.204-208 |
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| container_title | Physica. B, Condensed matter |
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| creator | Sundara Venkatesh, P. Ramakrishnan, V. Jeganathan, K. |
| description | We report the observation of Raman silent modes of B1low (276cm−1) and B1high (582cm−1) in vertically aligned ZnO nanorods due to the breakdown of translational symmetry. The structural studies reveal the high crystalline nature of the ZnO nanorods on the lattice mismatched silicon substrates. The dominant donor bound exciton emission and the phonon replicas signify the good quality of the nanorods which substantiate that the anomalous Raman modes could not be attributed to the intrinsic point defects. Further, our results show that the observed silent modes of wurtzite-ZnO become Raman active due to the breakdown of the wave-vector selection rule by loss of translational symmetry induced by nanorods geometry. |
| doi_str_mv | 10.1016/j.physb.2015.11.010 |
| format | Article |
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B, Condensed matter</title><description>We report the observation of Raman silent modes of B1low (276cm−1) and B1high (582cm−1) in vertically aligned ZnO nanorods due to the breakdown of translational symmetry. The structural studies reveal the high crystalline nature of the ZnO nanorods on the lattice mismatched silicon substrates. The dominant donor bound exciton emission and the phonon replicas signify the good quality of the nanorods which substantiate that the anomalous Raman modes could not be attributed to the intrinsic point defects. Further, our results show that the observed silent modes of wurtzite-ZnO become Raman active due to the breakdown of the wave-vector selection rule by loss of translational symmetry induced by nanorods geometry.</description><subject>Alignment</subject><subject>Breakdown</subject><subject>Condensed matter</subject><subject>Crystal structure</subject><subject>Lattice vibration</subject><subject>Nanorods</subject><subject>Photoluminescence</subject><subject>Raman spectroscopy</subject><subject>Silent modes</subject><subject>Symmetry</subject><subject>Zinc oxide</subject><subject>ZnO nanorods</subject><issn>0921-4526</issn><issn>1873-2135</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNp9kD1PwzAURS0EEqXwC1g8siT4xY2dDB1QxZdUqRKChcVy7BdwldjBTiv13xMoM2-5yz1XeoeQa2A5MBC323z4PKQmLxiUOUDOgJ2QGVSSZwXw8pTMWF1AtigLcU4uUtqy6UDCjCxfdK89Ta5DP9I-WEzUebrHODqju-5Adec-PFq68zYMU777DfXahxhsuiRnre4SXv3lnLw93L-unrL15vF5dbfODOdizKoGeGOxxFZwZhFsgVBYI0xt6lZaaIRclKAbiRUzUtS1EFBKaZhE3RSN4HNyc9wdYvjaYRpV75LBrtMewy4pqFjFagklTFV-rJoYUorYqiG6XseDAqZ-ZKmt-pWlfmQpADXJmqjlkcLpi73DqJJx6A1aF9GMygb3L_8NCitzvQ</recordid><startdate>20160115</startdate><enddate>20160115</enddate><creator>Sundara Venkatesh, P.</creator><creator>Ramakrishnan, V.</creator><creator>Jeganathan, K.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20160115</creationdate><title>Raman silent modes in vertically aligned undoped ZnO nanorods</title><author>Sundara Venkatesh, P. ; Ramakrishnan, V. ; Jeganathan, K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c336t-8b13bde5ef630de1d2e12dc6c9c9f7d1b67451ab7e80c7699661577c07eab2b63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Alignment</topic><topic>Breakdown</topic><topic>Condensed matter</topic><topic>Crystal structure</topic><topic>Lattice vibration</topic><topic>Nanorods</topic><topic>Photoluminescence</topic><topic>Raman spectroscopy</topic><topic>Silent modes</topic><topic>Symmetry</topic><topic>Zinc oxide</topic><topic>ZnO nanorods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sundara Venkatesh, P.</creatorcontrib><creatorcontrib>Ramakrishnan, V.</creatorcontrib><creatorcontrib>Jeganathan, K.</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physica. 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The dominant donor bound exciton emission and the phonon replicas signify the good quality of the nanorods which substantiate that the anomalous Raman modes could not be attributed to the intrinsic point defects. Further, our results show that the observed silent modes of wurtzite-ZnO become Raman active due to the breakdown of the wave-vector selection rule by loss of translational symmetry induced by nanorods geometry.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.physb.2015.11.010</doi><tpages>5</tpages></addata></record> |
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| issn | 0921-4526 1873-2135 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Alignment Breakdown Condensed matter Crystal structure Lattice vibration Nanorods Photoluminescence Raman spectroscopy Silent modes Symmetry Zinc oxide ZnO nanorods |
| title | Raman silent modes in vertically aligned undoped ZnO nanorods |
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