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The hollowing mechanism proposed is that absorption of surfactants onto the Cu surface facilitates the formation of the void interior through an oxidative etching process. Upon extending the reaction up to 4 h, fragmentation, oxidation, and self\u2010assembly were observed and the CuO ellipsoidal structures were formed. The headgroup lengths of the surfactants influenced the degree of CuO ellipsoidal formation, whereby longer surfactants favored the generation of ellipsoids. Optical absorption measured by UV\u2010visible spectroscopy was used to monitor both oxidation courses of Cu\u2192Cu<jats:sub>2<\/jats:sub>O and Cu<jats:sub>2<\/jats:sub>O\u2192CuO and to determine the band\u2010gap energies as 2.4 eV for Cu<jats:sub>2<\/jats:sub>O nanoshells and 1.89 eV for CuO ellipsoids. For the contact\u2010angle measurements, the wettability changed from hydrophilicity (18\u00b0) to hydrophobicity (140\u00b0) as the Cu<jats:sub>2<\/jats:sub>O nanoshells shifted to CuO ellipsoids.<\/jats:p>","DOI":"10.1002\/chem.200501484","type":"journal-article","created":{"date-parts":[[2006,3,10]],"date-time":"2006-03-10T06:21:06Z","timestamp":1141971666000},"page":"3805-3810","source":"Crossref","is-referenced-by-count":37,"title":["Surfactant\u2010Assisted Hollowing of Cu Nanoparticles Involving Halide\u2010Induced Corrosion\u2013Oxidation Processes"],"prefix":"10.1002","volume":"12","author":[{"given":"Chih\u2010Chia","family":"Huang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jih Ru","family":"Hwu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wu\u2010Chou","family":"Su","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dar\u2010Bin","family":"Shieh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yonhua","family":"Tzeng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen\u2010Sheng","family":"Yeh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,4,20]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.38.11322"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1143\/JPSJ.67.3304"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1063\/1.330567"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1063\/1.363939"},{"key":"e_1_2_6_6_2","unstructured":"\u00a0"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja981579s"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature01990"},{"key":"e_1_2_6_9_2","first-page":"5670","volume":"10","author":"Cristau H. 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