Room temperature PL spectra of the T10ATP aptamer-treated GaAs samples as well as that of an untreated substrate: (a) following the initial probe functionalization and (b) after exposure to the ATP or GTP solution.
Schematic representation of the proposed mechanism responsible for the biorecognition-facilitated change in the GaAs luminescence: (a) prior to the target sensing and (b) after the binding of the target ATP ligands.
PL spectra of GaAs substrates modified with thiolated T10ATP, nonthiolated T10ATP, as well as that of an untreated substrate.
A comparison of room temperature PL spectra of an ATP-treated T10ATP sample before and after dissociation (denoted as and -ATP, respectively), a T10ATP sample, and an untreated GaAs substrate.
Relative change in the peak PL intensity of the oligonucleotide-modified GaAs samples as a function of the aptamer probe length: (a) PL yield of the aptamer functionalized sample relative to that of an untreated substrate, (b) PL yield of the aptamer functionalized sample relative to that exposed to the ATP assay solution. The data reflect the natural logarithm of the specified PL ratios divided by the GaAs absorption coefficient, (experimental data: ●, model fit: – – –). The error bars correspond to the standard deviation in the PL measurements obtained at three different locations on the surface of each sample.
Sequences of the oligonucleotide aptamer probes.
Material parameters used in the modeling computation.
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