Improving signal-to-noise performance for DNA translocation in solid-state nanopores at MHz bandwidths.
Nano Lett
; 14(12): 7215-20, 2014 Dec 10.
Article
em En
| MEDLINE
| ID: mdl-25418589
ABSTRACT
DNA sequencing using solid-state nanopores is, in part, impeded by the relatively high noise and low bandwidth of the current state-of-the-art translocation measurements. In this Letter, we measure the ion current noise through sub 10 nm thick Si3N4 nanopores at bandwidths up to 1 MHz. At these bandwidths, the input-referred current noise is dominated by the amplifier's voltage noise acting across the total capacitance at the amplifier input. By reducing the nanopore chip capacitance to the 1-5 pF range by adding thick insulating layers to the chip surface, we are able to transition to a regime in which input-referred current noise (â¼ 117-150 pArms at 1 MHz in 1 M KCl solution) is dominated by the effects of the input capacitance of the amplifier itself. The signal-to-noise ratios (SNRs) reported here range from 15 to 20 at 1 MHz for dsDNA translocations through nanopores with diameters from 4 to 8 nm with applied voltages from 200 to 800 mV. Further advances in bandwidth and SNR will require new amplifier designs that reduce both input capacitance and input-referred amplifier noise.
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Base de dados:
MEDLINE
Assunto principal:
DNA
/
Análise de Sequência de DNA
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Condutometria
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Nanotecnologia
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Nanoporos
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article