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(a); (b) FESEM micrographs of the silica nanocords in low and high magnification, respectively; (c) FESEM image of a single nanocord, and inset is a typical tip of a nanocord; (d) EDX spectrum taken from the nanocords.
(a), (b) TEM images of silica nanocords. The splitting and connection behaviors can be seen. Inset of (b) is the corresponding SAED pattern.
(a) Room temperature PL spectra of the silica nanocords. (-∎-) freshly prepared sample recorded immediately. (-▴-) PL recorded after the sample being stored in humidistat for . (-●-) PL recorded after the sample being dried for again; (b) the reversible blue light intensity under the alternation of humid and dry treatments.
FTIR transmission spectra of the silica nanocords: (a) Freshly prepared sample recorded immediately; (b) recorded after the sample being stored in humidistat for ; (c) recorded after the sample being dried for .
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