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Nanopore-array-dispersed semiconductor quantum dots as nanosensors for gas detection
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View: Figures


Image of FIG. 1.
FIG. 1.

AFM images of (a) a blank AAO substrate and (b) a CdSe QD drop-cast AAO sample.

Image of FIG. 2.
FIG. 2.

(a) PL spectra of CdSe/ZnS QDs cast on Si (curve 1) and cast on AAO supported on substrates with different coatings [curve 2: Si with 920 nm of , curve 3: Si with 235 nm of , curve 4: Si (with native ), curve 5: Si with 235 nm topped by 50 nm Au]. The inset in (a) is a PL comparison for supports 3 and 5, (b) fluorescence pictures of three (left) AAO/QD samples sitting on Si in comparison with the same QD cast on a Si substrate (right), (c) transmittance of a blank AAO and reflectance spectra of the Si substrates with different coatings used in (a).

Image of FIG. 3.
FIG. 3.

PL peak intensity responses to exposures of xylenes balanced in a dry air from an AAO/CdSe QD (core) sample placed on Si. The inset (a) shows two-cycle reversible PL enhancement of the sample upon exposure to a high level of xylenes vapor and the inset (b) is a zoomed-in sensing trace at low levels of xylenes.

Image of FIG. 4.
FIG. 4.

PL peak intensity change as a function of (a) BTX concentrations from an AAO/CdSe QD sample on Si, (b) a comparison of xylenes sensing characteristics of an AAO/CdSe/ZnS QD sample sitting on Si supports with/without an Au coating.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanopore-array-dispersed semiconductor quantum dots as nanosensors for gas detection