Colloidal CdSe Quantum Wires by Oriented Attachment

Pradhan, Narayan; Xu, Huifang; Peng, Xiaogang

doi:10.1021/nl052497m

Cited by 281 publications

(312 citation statements)

References 29 publications

(69 reference statements)

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“…The results are plotted in Figure 2. The most obvious feature in the plot is the large peak in k 13 at an amine concentration of 0.03 M. For k 12 and k 11 , the reaction rate rises almost linearly. The role of the amine is to depassivate the rod ends by stripping them of their surface ligands (Figure 1).…”

Section: Resultsmentioning

confidence: 95%

A multi-rate kinetic model for spontaneous oriented attachment of CdS nanorods

Gunning

O'Sullivan

Ryan

2010

Phys. Chem. Chem. Phys.

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Abstract:A multi rate kinetic model to explain the spontaneous oriented attachment of CdS nanorods in the presence of an amine is presented. The model demonstrates the reasons that elongation is restricted to a maximum of quadruple the starting rod length for rods of a certain aspect ratio (8 x 30 nm) with no elongation occurring for rods of a shorter aspect ratio. The rate constants for all possible attachment events are determined showing that elongation by attachment occurs sequentially by single rod addition alone. Both the reaction rate and the activation energy for subsequent attachment are found to increase as the rod lengthens. The increase in reaction rate correlates with increased dipole moment of longer rods which orients the rods end to end to maximize collision events. The two components of this reaction are alignment and fusion, with the former restricting attachment of low aspect ratio rods and the latter restricting attachment to higher aspect ratio rods. The model therefore predicts an aspect ratio "window" in which oriented attachment of nanorods is energetically possible.2

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Section: Resultsmentioning

confidence: 95%

A multi-rate kinetic model for spontaneous oriented attachment of CdS nanorods

Gunning

O'Sullivan

Ryan

2010

Phys. Chem. Chem. Phys.

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“…[73] The diameter of the final wires could be tuned by changing the reaction temperature, or by using different long-chain amines. Longer-chain amines produced larger wires (Fig.…”

Section: Oriented Attachmentmentioning

confidence: 99%

“…Oriented attachment strategies: a,b) HRTEM image of CdSe nanowires synthesized by reacting cadmium acetate with selenourea in the presence of long-chain amines of different lengths-DDA stands for dodecylamine, while HDA stands for hexadecylamine. [73] c) HRTEM image of ZnSe nanowires formed by reacting zinc acetate with selenourea in the presence of octadecylamine. [75] d,e) HRTEM and TEM images of PbSe nanowires formed by reacting lead oleate with trioctylphosphine selenide in the presence of oleic acid, and oleic acid and tetradecylphosphonic acid, respectively.…”

Section: Future Directions and Challengesmentioning

confidence: 99%

See 1 more Smart Citation

Ultrathin Nanowires—A Materials Chemistry Perspective

2009

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The recent years have seen an explosive interest in one‐dimensional nanostructures1, as testified by the number of citations this field has accrued; as customary, its blossoming was enabled by chemical breakthroughs that allowed the reproducible and affordable synthesis of such structures.2, 3 The limitations of those syntheses was in the diameter of the nanowires that it could produce (hardly < 10 nm), and in the use of expensive and low‐yield techniques, such as chemical vapor deposition (CVD). This paper attempts to summarize the very recent chemical breakthroughs that have allowed the production of ultrathin nanowires, often in solution, and often in gram‐scale quantities. By no means is this a comprehensive coverage of the field, which can in part be found in other excellent reviews1, 2, 4–6 but a selection of those contributions that we feel would most help put this emerging field in perspective. We will review the various synthetic strategies, their pros and cons, and we will give our best guesses as to the future directions of the field and what we can expect from it.

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“…The performance of the resultant devices may be improved because single crystal nanorod or nanowire arrays can offer direct pathways for carrier and thus accelerate transport rate and charge collection [11,15,16]. Many II-IV group nanorods, such as CdS, CdSe, CdTe, ZnS, ZnSe, and ZnTe, have been successfully synthesized in colloidal solutions [17][18][19][20][21][22]. However, except ZnO [23], there are only a few reports that describe the fabrication of aligned II-IV nanorod or nanowire arrays without involving of catalyst and/or templates [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%