title: CdSe Quantum Rod Formation Aided By In Situ TOPO Oxidation.
abstract: In-situ TOPO decomposition was accomplished by applying a vacuum at elevated temperatures to a precursor solution in the presence of oxygen, leading TOPO to oxidize to di-n-octylphosphinic acid (DOPA) and octylphosphonic acid (OPA). The mixed ligand system of tetradecylphosphonic acid (TDPA), DOPA and OPA produced CdSe QRs on the order of 4 nm in diameter and 20 nm in length. Solvent and ligand identification was performed by mass spectrometry and (31)P nuclear magnetic resonance spectroscopy. Transmission electron microscopy (TEM) was utilized to determine the morphology, size and crystal growth of the CdSe QRs. This method of CdSe QR synthesis is unique in that the phosphonic acids responsible for anisotropic growth are formed in situ, prior to the nucleation and growth of the nanorods. Without the oxidation of TOPO, CdSe quantum dots (QDs) were synthesized instead, as reported previously. This discovery reinforces the efficacy of DOPA and OPA molecules as critical ligands in the formation of 1-dimensional (1D) nanostructures.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064 USA.
authors.forename: Abraham
authors.initials: A
authors.lastname: Wolcott
authors.forename: Robert Carl
authors.initials: RC
authors.lastname: Fitzmorris
authors.forename: Omed
authors.initials: O
authors.lastname: Muzaffery
authors.forename: Jin Z
authors.initials: JZ
authors.lastname: Zhang
references.citation: Nano Lett. 2009 Feb;9(2):514-8
references.pmid: 19140702
references.citation: Nat Mater. 2003 Jun;2(6):382-5
references.pmid: 12764357
references.citation: J Am Chem Soc. 2008 Sep 17;130(37):12279-81
references.pmid: 18722426
references.citation: Nat Biotechnol. 2004 Jan;22(1):93-7
references.pmid: 14661026
references.citation: J Am Chem Soc. 2002 Apr 3;124(13):3343-53
references.pmid: 11916419
references.citation: Nano Lett. 2006 Jul;6(7):1479-82
references.pmid: 16834433
references.citation: J Am Chem Soc. 2008 Apr 30;130(17):5689-98
references.pmid: 18393427
references.citation: J Am Chem Soc. 2002 May 22;124(20):5782-90
references.pmid: 12010053
references.citation: J Am Chem Soc. 2001 Jan 10;123(1):183-4
references.pmid: 11273619
references.citation: J Phys Chem B. 2005 Oct 20;109(41):19320-8
references.pmid: 16853495
references.citation: Phys Rev Lett. 1990 Sep 24;65(13):1623-1626
references.pmid: 10042317
references.citation: Science. 1998 Sep 25;281(5385):2013-6
references.pmid: 9748157
references.citation: Nano Lett. 2008 Nov;8(11):3904-10
references.pmid: 18823149
references.citation: Nature. 2004 Jul 8;430(6996):190-5
references.pmid: 15241410
references.citation: J Am Chem Soc. 2002 Jun 19;124(24):7136-45
references.pmid: 12059239
references.citation: J Phys Chem B. 2006 Mar 23;110(11):5779-89
references.pmid: 16539525
references.citation: Science. 2002 Mar 29;295(5564):2425-7
references.pmid: 11923531
references.citation: Science. 2009 Jun 5;324(5932):1309-12
references.pmid: 19498166
references.citation: J Am Chem Soc. 2009 Apr 8;131(13):4983-94
references.pmid: 19296595
references.citation: Nano Lett. 2008 Oct;8(10):3488-92
references.pmid: 18729414
references.citation: J Phys Chem B. 2005 Apr 7;109(13):6183-92
references.pmid: 16851684
references.citation: J Am Chem Soc. 2007 Jan 17;129(2):305-12
references.pmid: 17212409
references.citation: Nano Lett. 2008 Oct;8(10):3521-4
references.pmid: 18754691
references.citation: J Am Chem Soc. 2005 Nov 9;127(44):15378-9
references.pmid: 16262395
references.citation: Nature. 2001 Jan 4;409(6816):66-9
references.pmid: 11343112
references.citation: Philos Trans A Math Phys Eng Sci. 2003 Feb 15;361(1803):241-55; discussion 56-7
references.pmid: 12639381
references.citation: Nature. 2000 Mar 2;404(6773):59-61
references.pmid: 10716439