A porous silica chip stores digital information in 121-letter DNA strands

The on-chip system produced DNA with higher yields and recovered encoded information after correcting errors.

Editorial illustration — not from the study.

Electrochemically directed DNA synthesis can place many writing sites on a semiconductor-compatible chip, but dense arrays may produce less DNA at each site. The researchers added a porous silica film with an interconnected network of pores, increasing the effective surface area while maintaining control over the chemical reactions used to build DNA strands.

The platform produced more than 1821 pmol of DNA per square centimeter—more than 11 times the yield of a flat silica surface. It also synthesized 121-nucleotide strands in parallel and was used to encode, write and recover digital information after error correction.

What the porous film does

The porous silica film improved the areal DNA yield to more than 1821 pmol/cm², representing more than an 11-fold increase compared with a planar silica substrate. The film supported efficient movement of reagents and stable electrochemical control during DNA synthesis. Error rates for deletions, insertions and substitutions were comparable to those reported for other laboratory-built DNA data-writing systems. The researchers synthesized 121-nucleotide strands in parallel and successfully recovered encoded digital information using error correction.

Why higher DNA yield matters

The results address a trade-off in electrochemical DNA synthesis: increasing the number of writing sites can reduce the amount of DNA made at each site, which may make data recovery less reliable. A porous film could increase the amount of DNA produced without giving up the spatial control needed for on-chip synthesis. The work therefore provides a route toward integrating higher-yield DNA writing with semiconductor-compatible devices, although the abstract does not establish the performance of a large-scale storage system.

Evidence and open questions

This is a journal article reporting a laboratory demonstration of a porous-silica on-chip DNA synthesis platform. The abstract reports yield measurements, comparisons with a planar silica surface, error statistics relative to other laboratory-built systems, and recovery of encoded information from 121-nucleotide strands. It does not provide details about the amount of digital information stored, the number of synthesis sites, storage duration, repeated read-and-write cycles, or performance at larger scale. The abstract also does not describe the exact error-correction method or give the individual error rates.

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