In Situ Chemical Oxidation of Ultrasmall MoOx Nanoparticles in Suspensions

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dc.contributor.ISNI0000 0003 8600 0978 (Hsu, JWP)
dc.contributor.VIAF243648305 (Hsu, JWP)
dc.contributor.authorLee, Yun-Ju
dc.contributor.authorBarrera, Diego
dc.contributor.authorLuo, Kaiyuan
dc.contributor.authorHsu, Julia W. P.
dc.date.accessioned2012-10-18T20:30:35Z
dc.date.available2012-10-18T20:30:35Z
dc.date.copyrighted2012
dc.date.created2012-07-23
dc.date.issued2012-07-23
dc.description.abstractNanoparticle suspensions represent a promising route toward low cost, large area solution deposition of functional thin films for applications in energy conversion, flexible electronics, and sensors. However, parameters such size, stoichiometry, and electronic properties must be controlled to achieve best results for the target application. In this report, we demonstrate that such control can be achieved via in situ chemical oxidation of M o O 𝑥 nanoparticles in suspensions. Starting from a microwave-synthesized suspension of ultrasmall ( 𝑑 ∼ 2  nm) M o O 𝑥 nanoparticles in n-butanol, we added H2O2 at room temperature to chemically oxidize the nanoparticles. We systematically varied H2O2 concentration and reaction time and found that they significantly affected oxidation state and work function of MoO𝑥 nanoparticle films. In particular, we achieved a continuous tuning of MoO𝑥 work function from 4.4 to 5.0 eV, corresponding to oxidation of as-synthesized MoO𝑥 nanoparticle (20% Mo6+) to essentially pure MoO3. This was achieved without significantly modifying nanoparticle size or stability. Such precise control of MoO𝑥 stoichiometry and work function is critical for the optimization of MoO𝑥 nanoparticles for applications in organic optoelectronics. Moreover, the simplicity of the chemical oxidation procedure should be applicable for the development of other transition oxide nanomaterials with tunable composition and properties.en_US
dc.identifier.bibliographicCitationYun-Ju Lee, Diego Barrera, Kaiyuan Luo, and Julia W. P. Hsu, “In Situ Chemical Oxidation of Ultrasmall MoOx Nanoparticles in Suspensions,” Journal of Nanotechnology, vol. 2012 (2012): 195761, doi:10.1155/2012/195761en_US
dc.identifier.issn1687-9503
dc.identifier.urihttp://hdl.handle.net/10735.1/2313
dc.languageEnglishen_US
dc.relation.urihttp://dx.doi.org/10.1155/2012/195761en_US
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights© 2012, Yun-Ju Lee, et alen_US
dc.source.journalJournal of Nanotechnologyen_US
dc.subjectNanoparticlesen_US
dc.subjectThin filmsen_US
dc.subjectOptoelectronicsen_US
dc.titleIn Situ Chemical Oxidation of Ultrasmall MoOx Nanoparticles in Suspensionsen_US
dc.typeTexten_US
dc.type.genrearticleen_US

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