Site‐Specific Placement of Au Nanoparticles on Chemical Nanopatterns Prepared by Molecular Transfer Printing Using Block‐Copolymer Films

Önses, M. Serdar; Thode, Christopher J.; Liu, Chi‐Chun; Ji, Shengxiang; Cook, Peter L.; Himpsel, F. J.; Nealey, Paul F.

doi:10.1002/adfm.201100300

Cited by 30 publications

(27 citation statements)

References 61 publications

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“…The PEG‐OH grafts to the silicon dioxide regions during annealing through condensation reaction between the hydroxyl groups of the brush and the silanol groups of the substrate. The cross‐linked PS mat prevents interpenetration and grafting of PEG‐OH to the background regions 20. Removal of the unreacted and excess PEG‐OH results in the nanopatterns of PEG brushes in a background of cross‐linked PS mat (Figure 1c).…”

Section: Resultsmentioning

confidence: 99%

“…The challenge is to control the assembly of individual NPs that are available through colloidal approaches12 with high throughput and precisely tailored13 size, shape and structure and therefore desirable surface plasmon resonances. Among different methods,14–19 selective immobilization of NPs on the chemical nanopatterns20–24 offers variable particle‐substrate interaction, scalability and applicability to different types of particles. The essential aspect of the process is to develop robust ways of varying the substrate‐particle interaction at a resolution on the order of the diameter (<100 nm) of the particles.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Önses

Nealey

2013

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The organization of metallic nanoparticles (NPs) into ordered arrays on nanopatterned surfaces is an enabling process to fabricate devices and study the properties of the particles. Tailoring the interaction between NPs and nanopatterns is a necessity to gain a high level of control in this process. Here, nanopatterned poly(ethylene glycol) (PEG) brushes are presented as a platform for the organization of Au NPs on surfaces. The binding of citrate-stabilized Au NPs to the PEG brushes depends on the size of the particles and molecular weight of the brushes: the density of NPs immobilized on the nanopatterns of PEG brushes increases with decreasing the diameter of the particles and increasing the chain length of the brushes. The key aspect of the process is to pattern PEG brushes with high resolution and chemical contrast to provide controllable and specific interaction between Au NPs and nanopatterns at a single particle resolution. The modulation of the number (0-4) of Au NPs (e.g., 30 nm) per patterned feature with a high level of accuracy and the generation of patterned heterostructures that consist of two different sizes (e.g., 40 and 20 nm) of particles constitute two examples showing the capabilities of the presented platform.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Önses

Nealey

2013

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“…Therefore, the surface chemical contrast of the substrate is crucial for the successful patterning of NPs. It is important to note that some Au NPs deviate, so‐called “wobble”, from the perfectly centered position of the prepattern spots, resulting in a distribution window for the interparticle distance . Sequential immobilization of Au NPs with different diameters (250, 80, and 30 nm) yields arrays with desired NP arrangement, cascading from large to small (Figure e,f).…”

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confidence: 99%

Deterministic Construction of Plasmonic Heterostructures in Well‐Organized Arrays for Nanophotonic Materials

Biswas

Jarrett

et al. 2015

Advanced Materials

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Plasmonic heterostructures are deterministically constructed in organized arrays through chemical pattern directed assembly, a combination of top-down lithography and bottom-up assembly, and by the sequential immobilization of gold nanoparticles of three different sizes onto chemically patterned surfaces using tailored interaction potentials. These spatially addressable plasmonic chain nanostructures demonstrate localization of linear and nonlinear optical fields as well as nonlinear circular dichroism.

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“…Several methods have been employed to form NP chains, often utilizing polymer templates to direct the assembly of NPs . For example, there have been many studies of NP self‐assembly at interfaces within and on the surfaces of block copolymers, but these systems are limited by the morphologies of block copolymers. Here, our focus is on template‐free self‐assembly of magnetic NPs, where MFDSA has potential to provide control and tunability over the self‐assembly process without the use of templates.…”

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confidence: 99%

Magnetic Field‐Directed Self‐Assembly of Magnetic Nanoparticle Chains in Bulk Polymers

Krommenhoek

Tracy

2013

Part & Part Syst Charact

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Self-assembly is the thermodynamically guided organization of disordered systems into more highly ordered structures. The process of life exemplifi es the power and diversity of selfassembly, and understanding and controlling self-assembly is crucial for engineering advanced materials from molecular and nanoscale precursors. Nature has preceded researchers' efforts in magnetic fi eld-directed self-assembly (MFDSA) in magnetotactic bacteria, which navigate in the earth's magnetic fi eld using magnetically coupled chains of iron oxide nanoparticles (NPs). [ 1 ] Here, we report the MFDSA of magnetic NPs into threedimensional (3D) arrays of chains embedded within bulk poly mers, where no volatile solvent is present during the polymerization process. Application of uniform magnetic fi elds drives formation of magnetic NP chains that repel each other, resulting in their assembly into an array with quasiperiodic ordering. Removing the solvent from a 3D structure would cause collapse due to capillary forces. Therefore, special measures are required to preserve the structure [ 2 ] after removing the fi eld, such as embedding within a polymer. Polymer composites and thin fi lms containing NPs, including magnetic NPs, are well known, [3][4][5][6][7][8][9][10][11][12][13][14][15][16] as are microgels [ 17 ] and microcapsules. [ 18 ] There is signifi cant interest in embedding NP chains within polymers for their potentially anisotropic mechanical, [ 19 ] electrical, optical, magnetic, and thermal properties. Diverse applications are envisioned, including actuators, [ 20,21 ] artifi cial cilia, [ 22,23 ] ferrogels, [24][25][26] sensors, [ 27 ] polymer solar cells, [ 28,29 ] electromagnetic interference (EMI) shielding, [ 30,31 ] and drug delivery. [ 32 ] Several methods have been employed to form NP chains, often utilizing polymer templates to direct the assembly of NPs. [ 33 ] For example, there have been many studies of NP selfassembly at interfaces within [34][35][36][37][38][39][40][41][42][43][44][45][46] and on the surfaces of block copolymers, [47][48][49][50] but these systems are limited by the morphologies of block copolymers. Here, our focus is on template-free self-assembly of magnetic NPs, where MFDSA has potential to provide control and tunability over the self-assembly process without the use of templates.Stellacci and co-workers [ 51 ] have assembled magnetic NP chains in zero fi eld by crosslinking the ligand shells, [ 52 ] but most examples of magnetic NP chaining have utilized magnetic interactions between the NPs: Magnetotactic bacteria synthesize iron oxide NPs that form chains through magnetic interactions. Cryogenic TEM measurements of solutions of iron oxide NPs by Philipse and co-workers [ 53,54 ] showed that magnetic NPs spontaneously form disordered chains in solution in zero applied fi eld, if the NP diameter exceeds a minimum size. Pyun and co-workers [ 55,56 ] have also shown that strongly interacting Co NPs spontaneously form chains, and application of magnetic fi elds causes the chains to straig...

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Site‐Specific Placement of Au Nanoparticles on Chemical Nanopatterns Prepared by Molecular Transfer Printing Using Block‐Copolymer Films

Cited by 30 publications

References 61 publications

Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Tunable Assembly of Gold Nanoparticles on Nanopatterned Poly(ethylene glycol) Brushes

Deterministic Construction of Plasmonic Heterostructures in Well‐Organized Arrays for Nanophotonic Materials

Magnetic Field‐Directed Self‐Assembly of Magnetic Nanoparticle Chains in Bulk Polymers

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