Free-Standing, Patternable Nanoparticle/Polymer Monolayer Arrays Formed by Evaporation Induced Self-Assembly at a Fluid Interface

Pang, Jiebin; Xiong, Shenglin; Jaeckel, Felix T.; Sun, Zaicheng; Dunphy, Darren R.; Brinker, C. Jeffrey

doi:10.1021/ja710994m

Cited by 62 publications

(65 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, a number of techniques have been proposed to pattern different porous oxides, including soft lithography, micro-pen lithography, ink-jet printing, dipcoating and electron beam lithography2122232425262728. These techniques have been used to hierarchically organize nanoporous materials for sensor arrays, micro fluidic or photonic systems.…”

mentioning

confidence: 99%

“…Indirect approaches such as soft lithography21 suffer from complex process involving additional moulds that have to be patterned in advance. Some approaches including pen lithography, ink-jet printing and electron beam lithography write or print the patterns of functional materials directly22232425262728. But they are not efficient approaches that are designed for wafer-level processing, which is the key to batch fabrication of micro devices.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Direct Prototyping of Patterned Nanoporous Carbon: A Route from Materials to On-chip Devices

Shen

Wang

Zhang

et al. 2013

Sci Rep

View full text Add to dashboard Cite

Prototyping of nanoporous carbon membranes with three-dimensional microscale patterns is significant for integration of such multifunctional materials into various miniaturized systems. Incorporating nano material synthesis into microelectronics technology, we present a novel approach to direct prototyping of carbon membranes with highly nanoporous structures inside. Membranes with significant thicknesses (1 ~ 40 μm) are rapidly prototyped at wafer level by combining nano templating method with readily available microfabrication techniques, which include photolithography, high-temperature annealing and etching. In particular, the high-surface-area membranes are specified as three-dimensional electrodes for micro supercapacitors and show high performance compared to reported ones. Improvements in scalability, compatibility and cost make the general strategy promising for batch fabrication of operational on-chip devices or full integration of three-dimensional nanoporous membranes with existing micro systems.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Direct Prototyping of Patterned Nanoporous Carbon: A Route from Materials to On-chip Devices

Shen

Wang

Zhang

et al. 2013

Sci Rep

View full text Add to dashboard Cite

show abstract

“…For the quantum-dot fabrication and deposition, a close-packed PbS quantum-dot monolayer was created using evaporation-induced nanoparticles/polymer self-assembly [35]at a fluid interface, followed by monolayer transfer as recently reported [36]. Because the monolayer has a high modulus, it remains freely suspended over air holes without adhering to the side walls.…”

Section: All Lithography Was Performed On An Asml Pas 5500mentioning

confidence: 99%

“…Moreover, colloidal QDs provide greater material and functionality flexibilities. Incorporation of QD can occur during post-processing, under ambient conditions using self-assembly of ligand functionalized QDs [23,35,37]. These quantum dots are purchased from Evident Technologies.…”

Section: All Lithography Was Performed On An Asml Pas 5500mentioning

confidence: 99%

Efficient multi-exciton emission from quantum dots.

Luk¹

2010

View full text Add to dashboard Cite

The fundamental spontaneous emission rate an emitter can be modified by its photonic environment. By enhancing the spontaneous emission rate, there is a possibility of extracting multi-exciton energies through radiative decay. In this report, we explore using high Q and small volume cavities to enhance the spontaneous emission rate. We observed greater than 50 folds enhancement in the spontaneous emission from photonic crystal waveguide or microcavity using close-packed monolayer of PbS quantum dot emitters. 4 ACKNOWLEDGMENTSThe successful completion of this project is the result of the efforts of many people: Ihab ElKady, Mehmet Su, and Bernardo Farfan for performing FDTD numerical simulations; Jeff Brinker and Shisheng Xiong for developing integration techniques to transfer or embed QDs into 2D and 3D photonic crystal; Paul Resnick for fabricating 2D and 3D photonic crystal; Weng Chow for scientific guidance and simulating discussions; Ganesh Subramania, Mike Sinclair, Rohan Ketatpure, Xiaoyu Miao, Alon Gabbay and Art Fischer for discussions and helping in experimental data interpretation in this project.5

show abstract

“…As recently reported [4], we create a close-packed PbS quantum-dot monolayer by evaporation-induced nanoparticles/polymer self-assembly at a fluid interface, followed by monolayer transfer.…”

mentioning

confidence: 96%

Strong Purcell enhancement of emission from close-packed colloidal quantum-dots in a photonic-lattice cavity

Luk

Xiong

Farfan

et al. 2010

2010 IEEE Photonics Society Winter Topicals Meeting Series (WTM)

View full text Add to dashboard Cite

High Purcell spontaneous emission enhancement factor of 116 is achieved by integrating a self-assembled, close packed monolayer of colloidal PbS quantum dots with a L3-type silicon photonic crystal cavity.High Q optical microcavities can be used to control the radiative process of dipole emitters, such as quantum dots, through photonic density of states control. By enhancing the spontaneous emission, heat dissipating non-radiative relaxations can be suppressed therefore resulting in greater light emitting efficiency and providing a possibility of extracting multi-exciton energy by the emission process. In order to study the radiative control of quantum dots, it is important to be able to incorporate these emitters without perturbing the optical properties of the cavity. Serious challenges remain in integration of the photonic-crystal cavity structure and quantum dots without significant Q factor degradation. Standard spin-coating techniques fail to retain the inherent Q factor and achieve high quantumdot concentration, consistent film thickness and controlled uniform particle separation from the surface.This paper reports progress in meeting some of these challenges. We achieved an enhanced emission factor of 116 from close-packed PbS quantum-dot/polymer monolayers transferred to a L3 Si photonic-crystal cavity with Q factor around 2860. This is a significant improvement over previously reported Purcell factor[1] of 10 involving colloidal quantum dots [2]. The key factor enabling this result is the ability to deposit a 20nm thick monolayer of close-packed quantum dots onto a photoniccrystal cavity to provide direct contact with the cavity. The quantum-dot density of 10 4 Pm -2 , which is over two orders of magnitude higher than typical with Stranski-Krastanow growth, directly contributes to high emission intensity and mitigates the difficulty of placing dots selectively at the anti-nodes of the optical modes. An optimal mode confinement factor is guaranteed by the uniformity (on the scale of an optical wavelength) of dot density throughout the cavity volume.The experiments were performed with L3 (a row of three missing air holes) photonic-crystal Fig. 1. (a) SEM image of photonic crystal, with upper left inset providing a detailed view of the holes (240nm diameter) and lower right inset showing the hole edges and sidewalls. The lower left inset provides a schematic diagram of the photoluminescence measurement geometry. (b) Top view of two identical L3-type photonic crystal cavities. (c) TEM image of a free-standing PbS quantum dot/P3HT polymer monolayer to be transferred to the photonic crystal surface.

show abstract

Free-Standing, Patternable Nanoparticle/Polymer Monolayer Arrays Formed by Evaporation Induced Self-Assembly at a Fluid Interface

Cited by 62 publications

References 26 publications

Direct Prototyping of Patterned Nanoporous Carbon: A Route from Materials to On-chip Devices

Direct Prototyping of Patterned Nanoporous Carbon: A Route from Materials to On-chip Devices

Efficient multi-exciton emission from quantum dots.

Strong Purcell enhancement of emission from close-packed colloidal quantum-dots in a photonic-lattice cavity

Contact Info

Product

Resources

About