Chemical Locking in Molecular Tunneling Junctions Enables Nonvolatile Memory with Large On-Off Ratios

Sumit Kumar, Michele Merelli, Wojciech Danowski, Petra Rudolf, Ben L Feringa, Ryan C Chiechi*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

17 Citaten (Scopus)
190 Downloads (Pure)


This paper describes the reversible chemical locking of sypiropyran switches bound to metallic surfaces to enable the encoding of nonvolatile information. Data are encoded spatially by selectively locking the spiropyran moieties in their merocyanine form using a combination of exposure to acid and UV light. Without exposure to acid, the merocyanine form spontaneously converts back to the spiropyran form. Bits are resolved by defining the regions of the monolayer that are exposed to acid, using a "soft punchcard" fabricated from a silicone elastomer. Information is read by measuring the tunneling charge-transport through the monolayer using eutectic Ga-In top-contacts. The merocyanine form is more than three orders of magnitude more conductive than the spiropyran form, allowing the differentiation of bits. Photoelectron spectroscopy shows that the monolayers are undamaged by exposure to light, acid, base, and applied bias, enabling proof-of-concept devices in which an 8-bit ASCII encoded six-character string is written, erased, and rewritten.

Originele taal-2English
Aantal pagina's6
TijdschriftAdvanced materials
Nummer van het tijdschrift15
Vroegere onlinedatum5-feb-2019
StatusPublished - 12-apr-2019

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