Nanodiamond (ND) is surrounded by layers of graphite on its surface. This unique structure feature creates unusual fluorescence spectra, which can be used as an indicator to monitor its surface modification. Meanwhile, the impurity, nitroso (CNO) inside the ND can be photolyzed by two-photon absorption, releasing NO to facilitate the formation of a sp3 diamond structure in the core of ND and transforming it into a sp2 graphite structure. Such a conformational transition enlarges the size of ND from 8to90nm, resulting in a popcornlike structure. This transition reaction may be useful as nanoknives in biomedical application.
The sub-microdoughnut-like copper periodic structure is fabricated by an electroplating method on a patterned Ni template. The diameter of the cover Cu doughnut hole can be controlled by plating duration. This structure can be applied in a biosensor due to surface plasmonic resonance, and for a novel optical device with a variable hole diameter and period of that array. The magnetic force microscope was used for evaluating the biosensing response under the addition of magnetic proteins (metallothionein,
Mn2Cd5
metallothionein, and ferritin) on that sample before and after magnetization. In addition, the optical properties before and after magnetization were measured and scanned by Fourier transform IR spectroscopy. Some interesting behaviors were observed in the spectra and transmitting ratio under different polarization incident conditions.
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