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• W2896671390 startingPage "11458" @default.
• W2896671390 abstract "Nanopores with diameters from 20 to 50 nm in silicon nitride (SiN x) windows are useful for single-molecule studies of globular macromolecules. While controlled breakdown (CBD) is gaining popularity as a method for fabricating nanopores with reproducible size control and broad accessibility, attempts to fabricate large nanopores with diameters exceeding ∼20 nm via breakdown often result in undesirable formation of multiple nanopores in SiN x membranes. To reduce the probability of producing multiple pores, we combined two strategies: laser-assisted breakdown and controlled pore enlargement by limiting the applied voltage. Based on laser power-dependent increases in nanopore conductance upon illumination and on the absence of an effect of ionic strength on the ratio between the nanopore conductance before and after laser illumination, we suggest that the increased rate of controlled breakdown results from laser-induced heating. Moreover, we demonstrate that conductance values before and after coating the nanopores with a fluid lipid bilayer can indicate fabrication of a single nanopore versus multiple nanopores. Complementary flux measurements of Ca2+ through the nanopore typically confirmed assessments of single or multiple nanopores that we obtained using the coating method. Finally, we show that thermal annealing of CBD pores significantly increased the success rate of coating and reduced the current noise before and after lipid coating. We characterize the geometry of these nanopores by analyzing individual resistive pulses produced by translocations of spherical proteins and demonstrate the usefulness of these nanopores for estimating the approximate molecular shape of IgG proteins." @default.
• W2896671390 created "2018-10-26" @default.
• W2896671390 creator A5003740844 @default.
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• W2896671390 creator A5041421899 @default.
• W2896671390 creator A5042752855 @default.
• W2896671390 creator A5047408109 @default.
• W2896671390 date "2018-10-18" @default.
• W2896671390 modified "2023-09-27" @default.
• W2896671390 title "Formation of Single Nanopores with Diameters of 20–50 nm in Silicon Nitride Membranes Using Laser-Assisted Controlled Breakdown" @default.
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