Resizing Metal‐Coated Nanopores Using a Scanning Electron Microscope

Chansin, G.; Hong, Jongin; Dusting, Jonathan; deMello, Andrew J.; Albrecht, Tim; Edel, Joshua B.

doi:10.1002/smll.201101015

Cited by 7 publications

(10 citation statements)

References 30 publications

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“…The faces of the nanocube exposed to the e-beam were coated with a noticeable carbon layer when viewed head-on under TEM (Figure 1A). While EBID is useful for a variety of applications, 15,17,21 it is a potential problem for SERS applications, which are extremely sensitive to surface contamination.…”

Section: Resultsmentioning

confidence: 99%

“…In order to determine the impact of the amorphous carbon on the ability to functionalize the Ag nanocubes post SEM imaging, we investigated the dependence of carbon deposition on e-beam current and exposure time, and then evaluated its impact on the SERS signals coming from the probe molecules. 15–17 …”

Section: Resultsmentioning

confidence: 99%

“…14 The potential drawback of using SEM is that amorphous carbon will be deposited on the sample during exposure to the e-beam in a process known as electron beaminduced deposition (EBID). [15][16][17][18][19][20] In a simple demonstration, we deposited Ag nanocubes on a TEM grid and imaged by the SEM at a tilt angle of 451 relative to the incoming e-beam. The faces of the nanocube exposed to the e-beam were coated with a noticeable carbon layer when viewed head-on under TEM (Fig.…”

Section: Deposition Of Amorphous Carbon During Sem Imagingmentioning

confidence: 99%

“…1A). While EBID is useful for a variety of applications, 15,17,21 it is a Paper PCCP potential problem for SERS applications, which are extremely sensitive to surface contamination. We used SEM to easily identify individual Ag nanocubes on a marked Si substrate with particular orientations prior to SERS measurements.…”

Section: Deposition Of Amorphous Carbon During Sem Imagingmentioning

confidence: 99%

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Improving correlated SERS measurements with scanning electron microscopy: an assessment of the problem arising from the deposition of amorphous carbon

Moran

Xia

2013

Phys. Chem. Chem. Phys.

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For surface-enhanced Raman scattering (SERS) substrates with nonspherical symmetry, it is critical to correlate spectroscopy measurements with imaging by scanning electron microscopy (SEM). However, the deposition of carbon resulting from e-beam exposure during SEM imaging contaminates the surface of nanoparticles, potentially preventing their further functionalization with Raman probe molecules. In addition, the deposited carbon leads to unwanted background SERS signals. In this study, we systematically investigated the deposition of carbon during SEM imaging and examined how it affects the functionalization of nanoparticles with probe molecules and impacts the detection of SERS signals. Significantly, we found that the carbon could be removed or replaced from the surface of Ag nanoparticles through a chemical or physical means, rendering the nanoparticles the capability for correlated SEM/SERS studies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Deposition Of Amorphous Carbon During Sem Imagingmentioning

confidence: 99%

Section: Deposition Of Amorphous Carbon During Sem Imagingmentioning

confidence: 99%

See 2 more Smart Citations

Improving correlated SERS measurements with scanning electron microscopy: an assessment of the problem arising from the deposition of amorphous carbon

Moran

Xia

2013

Phys. Chem. Chem. Phys.

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“…For example, the nanopores size could be tuned, shrinking in most cases, through depositing materials or thermal heating. [15][16][17] Nevertheless, few is reported about the structure reconstruction of the solid-state nanopores. As a subgroup of solid-state nanopores, the glass nanopipette is modeled as a cost-effective and versatile source of conical shaped nanopore and has been used for single DNA, protein, and nanoparticle (NP) analysis.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Carbon Structure-Based Glass Nanopipettes as Micro pH Probes

He¹,

Zhao²

2019

Preprint

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<p>Nanopore-based nanomaterials have been widely used to prepare the biosensor due to the unique structure, and the high sensitivity to the external stimuli under different environmental conditions. In this report, we ingeniously designed and prepared mesoporous carbon structure-based quartz nanopipettes. The mesoporous carbon was in situ grown in the tip working area of a single quartz nanopipette through the method of evaporation induced self-assembly (EISA). The mesoporous carbon could reduce the effective aperture of the nanopipette, while the surface area of nanopipette tip could be increased by the mesoporous carbon structure as well. The negative charges on the inner surface of the nanopipette increased significantly, which made the ionic current rectification of the nanopore more remarkable, with the ionic current rectification ratio increasing from 2.3 to 34.8. The mesoporous carbon-based glass nanopipette with good response to pH has been used for the probe of pH value of micro-volume solution. The test results were consistent with those obtained by using a commercial pH meter.<br></p>

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Wet-Chemical Enzymatic Preparation and Characterization of Ultrathin Gold-Decorated Single Glass Nanopore

Jin

2014

Anal. Chem.

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The conical glass nanopore was modified through layer-by-layer electrostatic deposition of a monolayer of glucose oxidase, and then an ultrathin gold film was formed in situ through enzyme-catalyzed reactions. The morphology and components of single glass nanopore before and after ultrathin Au deposition were characterized by transmission electron microscopy (TEM) and energy-dispersive X-ray (EDX) analysis, respectively. In particular, the quenching of the quantum dots fluorescence in the nanopore tip zone further illustrated that the gold nanofilm was successfully deposited on the inner wall of the single glass nanopore. The Au thin films make the glass nanopores more biologically friendly and allow the nanopores facile functionalization of the surface through the Au-S bonds. For instance, the ionic current rectification (ICR) properties of the gold-decorated glass nanopores could be switched readily at different pHs by introducing different thiol molecules.

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Resizing Metal‐Coated Nanopores Using a Scanning Electron Microscope

Cited by 7 publications

References 30 publications

Improving correlated SERS measurements with scanning electron microscopy: an assessment of the problem arising from the deposition of amorphous carbon

Improving correlated SERS measurements with scanning electron microscopy: an assessment of the problem arising from the deposition of amorphous carbon

Mesoporous Carbon Structure-Based Glass Nanopipettes as Micro pH Probes

Wet-Chemical Enzymatic Preparation and Characterization of Ultrathin Gold-Decorated Single Glass Nanopore

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