Observation of Ultrahigh Photoconductivity in DNA-MoS<sub>2</sub> Nano-Biocomposite.
basic_science · Level V
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- Record sourced from PubMed, PMID 38488277.
- Also identified by DOI 10.1002/adma.202400124.
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Abstract
A nano-biocomposite film with ultrahigh photoconductivity remains elusive and critical for bio-optoelectronic applications. A uniform, well-connected, high-concentration nanomaterial network in the biological matrix remains challenging to achieve high photoconductivity. Wafer-scale continuous nano-biocomposite film without surface deformations and cracks plays another major obstacle. Here ultrahigh photoconductivity is observed in deoxyribonucleic acid-molybdenum disulfide (DNA-MoS<sub>2</sub>) nano-biocomposite film by incorporating a high-concentration, well-percolated, and uniform MoS<sub>2</sub> network in the ss-DNA matrix. This is achieved by utilizing DNA-MoS<sub>2</sub> hydrogel formation, which results in crack-free, wafer-scale DNA-MoS<sub>2</sub> nano-biocomposite films. Ultra-high photocurrent (5.5 mA at 1 V) with a record-high on/off ratio (1.3 × 10<sup>6</sup>) is observed, five orders of magnitude higher than conventional biomaterials (≈10<sup>1</sup>) reported so far. The incorporation of the Wely semimetal (Bismuth) as an electrical contact exhibits ultrahigh photoresponsivity (2.6 × 10<sup>5</sup> A W<sup>-1</sup>). Such high photoconductivity in DNA-MoS<sub>2</sub> nano-biocomposite could bridge the gap between biology, electronics, and optics for innovative biomedicine, bioengineering, and neuroscience applications.