Figure 4: Mechanism of stabilization of metal-like monoclinic VO2 by surface coordination in the nanobeam. | Nature Communications

Figure 4: Mechanism of stabilization of metal-like monoclinic VO2 by surface coordination in the nanobeam.

From: Imaging metal-like monoclinic phase stabilized by surface coordination effect in vanadium dioxide nanobeam

Figure 4

(a) Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectra of pristine VO2, AA-treated VO2 sample and pure AA molecules, respectively. The enolic C–O–H scissoring and stretching vibration of AA molecule at 1,271 and 1,318 cm−1 labelled by red dots disappear in the AA-treated VO2 spectrum, and a new peak labelled by green triangle occurs at 1,390 cm−1 in the spectrum of AA-treated VO2 sample. (b) Depiction of the AA molecules absorbed on the end face of VO2 nanobeam with bidentate binding to surface vanadium atoms. (c) Diagram for the stepwise reaction of surface coordination of AA molecules on VO2 nanobeam. (d) Schematic of vanadium t2g orbitals in the VO2 phase.

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