Site-specific deposition of single gold nanoparticles by individual growth in electrohydrodynamically-printed attoliter droplet reactors

Schneider, Julian; Rohner, Patrik; Galliker, Patrick; Raja, Shyamprasad N.; Pan, Ying; Tiwari, Manish K.; Poulikakos, Dimos

doi:10.1039/c4nr06964a

Cited by 25 publications

(18 citation statements)

References 48 publications

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“…In the following, we studied larger devices with 5 µm wide and 50 µm long graphene channels to explore the detector performance. Nanoprinting of various inks containing metallic nanoparticles and QDs for a host of applications has already been demonstrated . Recent years have accumulated knowledge on the effect of ink properties and substrate wettability both influencing printing behavior and printing resolution .…”

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confidence: 99%

Nanoprinted Quantum Dot–Graphene Photodetectors

Grotevent

Hail

Yakunin

et al. 2019

Advanced Optical Materials

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State-of-the-art semiconductor-based infrared photodetectors such as epitaxially grown InGaAs and HgCdTe are expensive, not readily compatible with complementary metal-oxidesemiconductor fabrication, require sophisticated processing, Photodetectors utilizing graphene field-effect transistors sensitized by colloidal quantum dots exhibit high responsivities under infrared light illumination. Precise, microscopic spatial control over quantum dot deposition is required to gain deeper insight into device mechanisms, optimize device performance, and enable new device architectures and applications. The latter may eventually include photodetectors with subwavelength device dimensions. Here, infrared photodetectors are fabricated by electrohydrodynamic nanoprinting of colloidal PbS quantum dots onto graphene field-effect transistors with varying quantum dot layer thicknesses on a single substrate, demonstrating the potential of the method for realizing small footprint detectors with high spatial resolution. Remarkably, while the responsivity of the photodetectors increases with increasing layer thicknesses up to 130 nm, the noise current is found to be independent of the layer thickness. In addition, the responsivity and noise current are both linearly dependent on the applied drain voltage and drain current. As a result, the specific detectivity is independent of the drain voltage, and the detector can be operated at lower drain voltages thus reducing power consumption. Finally, specific detectivities of at least 10 9 Jones at 1200 nm are obtained, without degradation of the charge carrier mobilities in graphene from the electrohydrodynamic printing.

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confidence: 99%

Nanoprinted Quantum Dot–Graphene Photodetectors

Grotevent

Hail

Yakunin

et al. 2019

Advanced Optical Materials

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“…The isolated compartments with tiny volumes and large specific surface areas are ideal microreactors, transporters, and mixers for microscale experiments . Droplet microfluidic offers a large number of applications in small molecule detection, drug screening, single‐cell analysis, functional microparticles fabrication, tissue engineering, etc.…”

Section: Introductionmentioning

confidence: 99%

A Microfluidic Strategy for Controllable Generation of Water‐in‐Water Droplets as Biocompatible Microcarriers

Liu

Wang

Wei

et al. 2018

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Droplet microfluidics has been widely applied in functional microparticles fabricating, tissue engineering, and drug screening due to its high throughput and great controllability. However, most of the current droplet microfluidics are dependent on water-in-oil (W/O) systems, which involve organic reagents, thus limiting their broader biological applications. In this work, a new microfluidic strategy is described for controllable and high-throughput generation of monodispersed water-in-water (W/W) droplets. Solutions of polyethylene glycol and dextran are used as continuous and dispersed phases, respectively, without any organic reagents or surfactants. The size of W/W droplets can be precisely adjusted by changing the flow rate of dispersed and continuous phases and the valve switch cycle. In addition, uniform cell-laden microgels are fabricated by introducing the alginate component and rat pancreatic islet (β-TC6) cell suspension to the dispersed phase. The encapsulated islet cells retain high viability and the function of insulin secretion after cultivation for 7 days. The high-throughput droplet microfluidic system with high biocompatibility is stable, controllable, and flexible, which can boost various chemical and biological applications, such as bio-oriented microparticles synthesizing, microcarriers fabricating, tissue engineering, etc.

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“…Electrohydrodynamic (EHD) jet nanoprinting methods have lately become of high interest due to the ability to deposit materials and dimensions which previously could not be patterned by standard inkjet printing . In EHD jet printing, high voltage is applied between a needle and a substrate and pulls the liquid inks out of the nozzle.…”

Section: Introductionmentioning

confidence: 99%

Micrometer to 15 nm Printing of Metallic Inks with Fountain Pen Nanolithography

Yeshua

Layani

Dekhter

et al. 2017

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The field of printed electronics is continually trying to reduce the dimensions of the electrical components. Here, a method of printing metallic lines with widths as small as 15 nm and up to a few micrometers using fountain pen nanolithography (FPN) is shown. The FPN technique is based on a bent nanopipette with atomic force feedback that acts similar to a nanopen. The geometry of the nanopen allows for rapid placement accuracy of the printing tip, on any desired location, with the highest of optical sub‐micrometer resolution. Using this nanopen, investigations of various inks are undertaken together with instrumental and script‐tool development that allows accurate printing of multiple layers. This has led to the printing of conductive lines using inks composed of silver nanoparticles and salt solutions of silver and copper. In addition, it is shown that the method can be applied to substrates of various materials with minimal effect on the dimension of the line. The line widths are varied by using nanopens with different orifices or by tailoring the wetting properties of the ink on the substrate. Metallic interconnections of conducting lines are reported.

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Site-specific deposition of single gold nanoparticles by individual growth in electrohydrodynamically-printed attoliter droplet reactors

Cited by 25 publications

References 48 publications

Nanoprinted Quantum Dot–Graphene Photodetectors

Nanoprinted Quantum Dot–Graphene Photodetectors

A Microfluidic Strategy for Controllable Generation of Water‐in‐Water Droplets as Biocompatible Microcarriers

Micrometer to 15 nm Printing of Metallic Inks with Fountain Pen Nanolithography

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