Far-Infrared Absorption of PbSe Nanorods

Hyun, Byung Ryool; Bartnik, Adam; Koh, Weon-kyu; Agladze, N. I.; Wrubel, Jonathan; Sievers, A. J.; Murray, Christopher B.; Wise, Frank W.

doi:10.1021/nl201115h

Cited by 20 publications

(26 citation statements)

References 37 publications

(55 reference statements)

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“…In particular, enhanced multiple exciton generation efficiency [7][8][9][10] and suppressed Auger recombination rates [11][12][13] have been experimentally demonstrated in PbSe NWs. PbSe NWs can be grown using methods of colloidal chemistry [14][15][16][17][18][19]. The approach based on the oriented attachment of PbSe nanocrystals [15] enables controllable growth of NWs along the [100], [110] and [111] axes with straight, zigzag, helical, branched, and tapered shape.…”

Section: Introductionmentioning

confidence: 99%

“…Growth of high-quality monocrystalline PbSe [100] nanorods with homogeneous size distributions using a catalyst-free, one-pot, solution chemistry method has been reported in Refs. [16,17]. This technique offers control over the nanorod aspect ratio in the range from 1 to 16 [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…This technique offers control over the nanorod aspect ratio in the range from 1 to 16 [18,19]. Energy spectrum of the nanowires can be probed optically [17,[20][21][22]. Simple stationary linear absorption spectroscopy easily probes the effect of the nanorod size [21], and aspect ratio [18] on the fundamental energy gap.…”

Section: Introductionmentioning

confidence: 99%

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Valley and spin splittings in PbSe nanowires

et al. 2017

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We use an empirical tight-binding approach to calculate electron and hole states in [111]-grown PbSe nanowires. We show that the valley-orbit and spin-orbit splittings are very sensitive to the atomic arrangement within the nanowire elementary cell and differ for [111]-nanowires with microscopic $D_{3d}$, $C_{2h}$ and $D_{3}$ symmetries. For the nanowire diameter below 4 nm the valley-orbit splittings become comparable with the confinement energies and the $\boldsymbol{k}\cdot\boldsymbol{p}$ method is inapplicable. Nanowires with the $D_{3}$ point symmetry having no inversion center exhibit giant spin splitting $E = \alpha k_z$, linear in one-dimensional wave vector $k_z$, with the constant $\alpha$ up to 1 eV$\cdot$\AA.Comment: 15 pages, 9 figure

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Valley and spin splittings in PbSe nanowires

et al. 2017

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“…Additionally, PbSe nanorods are the first material to demonstrate the splitting of the Fröhlich mode in anisotropic structures. 5 While PbSe nanorods with aspect ratios of ~1.5 to 12, 7 with diameters from ~2.8 to 5.6 nm and lengths from 6 to 47 nm 7,8 have been synthesized, it has been difficult for us as well as other groups to reproduce such a wide aspect ratio range. 3 Therefore, there is a need for a greater understanding of the formation mechanism of PbSe nanorods such that uniform nanorods with aspect ratios over a broad range can be controllably synthesized.…”

Section: Introductionmentioning

confidence: 99%

Control of PbSe Nanorod Aspect Ratio by Limiting Phosphine Hydrolysis

et al. 2013

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The aspect ratio and yield of PbSe nanorods synthesized by the reaction of Pb-oleate with tris(diethylamino)phosphine selenide are highly sensitive to the presence of water, making it critical to control the amount of water present in the reaction. By carefully drying the reaction precursors and then intentionally adding water back into the reaction, the nanorod aspect ratio can be controlled from 1.1 to 10 and the yield from 1 to 14% by varying the water concentration from 0 to 204 mM. (31)P{(1)H} and (1)H NMR show that water reacts with tris(diethylamino)phosphine to create bis(diethylamido)phosphorous acid. It was determined that bis(diethylamido)phosphorous acid is responsible for the observed aspect ratio and yield changes. Finally, it was found that excess oleic acid in the reaction can also react with tris(diethylamino)phosphine to create bis(diethylamido)phosphorous acid, and upon the removal of both excess oleic acid and water, highly uniform, nonbranching nanorods were formed.

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“…[12,13] In addition, the large nonlinearity of PbSe NCs has also been reported, thereby rendering them attractive materials in nonlinear optics. [14] Currently, a considerable number of methods have been developed to fabricate PbSe NCs with various sizes and morphologies, including spheres, [15][16][17] cubes, [15,18,19] multipods, [18,20] rods, [18,21] octahedrons, [22] wires, [18,22] and rings. [22] The available synthetic methods generally use stabilizing ligands such as trioctylphosphine (TOPO) and lead sources such as lead acetate trihydrate or lead oxides.…”

Section: Introductionmentioning

confidence: 99%

A Facile Phosphine‐Free Method for Synthesizing PbSe Nanocrystals with Strong Optical Limiting Effects

Wang

Gao

Wang

et al. 2013

Chemistry An Asian Journal

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PbSe semiconductor nanocrystals (NCs) have attracted ever-growing interest owing to both their fundamental physics and potential applications in a diverse range of fields such as optoelectronic devices and nonlinear optics. The current fabrication strategy for colloidal PbSe NCs, however, frequently involves acutely toxic reagents and tedious reaction procedures, and is plagued by products with poorly controlled size and morphology. Herein, we report a facile, low-cost, and phosphine-free method for synthesizing PbSe NCs, which provides highly uniform NCs with tunable mid-IR absorption, and they are promising for bio-related applications. These high quality NCs were obtained by the reaction of elemental Se and PbCl2 in oleylamine as both the ligand and reaction medium. The high flexibility and reproducibility of the method reported in this study allows us to synthesize monodispersed PbSe NCs with well-controlled size and morphology. In addition, these products show strong optical limiting effects, and thus hold potential for developing nonlinear optical devices.

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Far-Infrared Absorption of PbSe Nanorods

Cited by 20 publications

References 37 publications

Valley and spin splittings in PbSe nanowires

Valley and spin splittings in PbSe nanowires

Control of PbSe Nanorod Aspect Ratio by Limiting Phosphine Hydrolysis

A Facile Phosphine‐Free Method for Synthesizing PbSe Nanocrystals with Strong Optical Limiting Effects

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