A thermo-responsive rewritable plasmonic bio-memory by regulating single core-satellite gold nanocluster dissociation

A thermo-responsive rewritable plasmonic bio-memory chip has been successfully fabricated on an ITO glass slide by assembling core-satellite gold nanoclusters with different size of AuNPs using dsDNA linker. And the prepared 70@DNA20@13 AuNCs exhibited more stable and greater photothermal conversion ability. With short time irradiation by 633 nm microbeam laser, every individual AuNCs could be excited and remove the satellite AuNPs on its surface. Especially, in the dissociation process of AuNCs with 3-5 satellite, its color would change from yellow to green, which showed more significant reduction in the red channel of the DFM images and could be defined to state “0” and “1” respectively. Besides, this plasmonic nano bio-memory could transform cyclically its state between 0 and 1 which exhibited excellent rewritable ability.