Recently, the Shanghai Institute of Applied Physics of the Chinese Academy of Sciences in cooperation with Monash University and IBM Corporation has prepared two-dimensional single-layer gold nanofilms through DNA-induced gold nanoparticle self-assembly, which can achieve the humidity-responsive discoloration. Related work is published online in Advanced Materials magazine.
The excellent photophysical properties of two-dimensional nanomaterials make it an important application prospect in the field of nano-optical/electrical and biosensor analysis. However, how to build two-dimensional nanomaterials from the bottom up by means of self-assembly methods and construct devices with macroscopic optical properties is a difficult problem. Shen Jianlei, Ph.D., Ph.D., Shanghai Institute of Physical Biology, Dr. Shen Jianlei, etc., under the guidance of researcher Fan Chunhai, and through collaboration with IBM professor Zhou Ruhong and Monash University professor Cheng Wenlong, achieved specific recognition of DNA to achieve gold nanoparticles on different interfaces. Centimeter single-layer assembly. Interestingly, the color of the single-layer gold nanofilm that was constructed reversibly changed with the change in the surrounding water content. Theoretical calculations show that the DNA is in a stretched state when wet, and the distance between the nanoparticles is longer. In the dry state, the DNA curls, resulting in a narrowing of the interparticle distance. Changes in particle spacing can alter the degree of plasmon resonance coupling of gold nanoparticles. By investigating the surface-enhanced Raman spectroscopy of the sample, the researchers found that the local electric field between the particles within the nanomembrane was significantly enhanced in the dry state. This result reveals the mechanism of color change at the macro scale caused by surface plasma co-coupling.
This phenomenon has potential application value in the fields of humidity monitoring, biosensing, information storage and photovoltaic.
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