Oriented Assembly of Gold Nanorods on the Single‐Particle Level

Kuemin, Cyrill; Nowack, Lea V.; Bozano, Luisa; Spencer, Nicholas D.; Wolf, Heiko

doi:10.1002/adfm.201101760

Cited by 147 publications

(172 citation statements)

References 49 publications

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“…In a study where chemically synthesized rod-like nanoparticles with an aspect ratio of 3 were used, the formation of an ordered crystalline phase was argued to be a prerequisite for the high-yield alignment of wires. 27 However, in our study, the electrochemically synthesized multisegmented nanowires have rough surfaces due to the rough pores in the AAO template 34 (Figure 3A, inset). As a result, it is difficult for the nanowires to pack closely and form ordered phases ( Figure 3A).…”

Section: Resultsmentioning

confidence: 55%

Capillary Force-Driven, Large-Area Alignment of Multi-segmented Nanowires

Zhou

et al. 2014

ACS Nano

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Section: Resultsmentioning

confidence: 55%

Capillary Force-Driven, Large-Area Alignment of Multi-segmented Nanowires

Zhou

et al. 2014

ACS Nano

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“…O riented assemblies of functional colloidal nanoparticles [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] are important for both fundamental science and technological applications. Such assemblies have been realized on two-dimensional (2D) solid substrates by utilizing evaporation-based convection 6,7 , capillary interaction 8 , electric fields 9,10 , substrate templating 11,12 and surface tailoring of nanoparticles 13,14 .…”

mentioning

confidence: 99%

“…Such assemblies have been realized on two-dimensional (2D) solid substrates by utilizing evaporation-based convection 6,7 , capillary interaction 8 , electric fields 9,10 , substrate templating 11,12 and surface tailoring of nanoparticles 13,14 . However, robust control over the orientation and position of nanoparticles in 3D solutions remains a formidable challenge, owing to thermal fluctuations and diffusion.…”

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confidence: 99%

Interfacial liquid-state surface-enhanced Raman spectroscopy

et al. 2013

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Oriented assemblies of functional nanoparticles, with the aid of external physical and chemical driving forces, have been prepared on two-dimensional solid substrates. It is challengeable, however, to achieve three-dimensional assembly directly in solution, owing to thermal fluctuations and free diffusion. Here we describe the self-orientation of gold nanorods at an immiscible liquid interface (that is, oleic acid-water) and exploit this novel phenomenon to create a substrate-free interfacial liquid-state surface-enhanced Raman spectroscopy. Dark-field imaging and Raman scattering results reveal that gold nanorods spontaneously adopt a vertical orientation at an oleic acid-water interface in a stable trapping mode, which is in good agreement with simulation results. The spontaneous vertical alignment of gold nanorods at the interface allows one to accomplish significant additional amplification of the Raman signal, which is up to three to four orders of magnitude higher than that from a solution of randomly oriented gold nanorods.

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“…Begin Controlling the position and orientation of nanorods (NRs) in a device is desirable [1][2][3][4][5] . In particular, an important property of NRs is their anisotropic absorption, and spontaneous and stimulated emission.…”

Section: Introductionmentioning

confidence: 99%

Polarized light emission by deposition of aligned semiconductor nanorods

et al. 2014

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The ability to control the position and orientation of nanorods in a device is interesting both from a scientific and a technological point of view. Because semiconductor nanorods exhibit anisotropic absorption, and spontaneous and stimulated emission, aligning individual NRs to a preferred axis is attractive for many applications in photonics such as solar cells, light-emitting devices, optical sensors, switches, etc. Electric-field-driven deposition from colloidal suspensions has proven to be an efficient method for the controlled positioning and alignment of anisotropic particles. In this work, we present a novel technique for the homogeneous deposition and alignment of CdSe/CdS NRs on a glass substrate patterned with transparent indium tin oxide interdigitated electrodes, with a spacing of a few micrometers. This method is based on applying a strong AC electric field over the electrodes during a dip-coating procedure and subsequent evaporation of the solvent. The reproducible and homogeneous deposition on large substrates is required for large size applications such as solar cells or OLEDs. The accumulation, alignment, and polarized fluorescence of the nanorods as a function of the electrical field during deposition are investigated. A preferential alignment with an order parameter of 0.92 has been achieve

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Oriented Assembly of Gold Nanorods on the Single‐Particle Level

Cited by 147 publications

References 49 publications

Capillary Force-Driven, Large-Area Alignment of Multi-segmented Nanowires

Capillary Force-Driven, Large-Area Alignment of Multi-segmented Nanowires

Interfacial liquid-state surface-enhanced Raman spectroscopy

Polarized light emission by deposition of aligned semiconductor nanorods

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