title: A novel enzyme-mimic nanosensor based on quantum dot-Au nanoparticle@silica mesoporous microsphere for the detection of glucose.
abstract: QD-Au NP@silica mesoporous microspheres have been fabricated as a novel enzyme-mimic nanosensor. CdTe quantum dots (QDs) were loaded into the core, and Au nanoparticles (NPs) were encapsulated in the outer mesoporous shell. QDs and Au NPs were separated in the different space of the nanosensor, which prevent the potential energy or electron transfer process between QDs and Au NPs. As biomimetic catalyst, Au NPs in the mesoporous silica shell can catalytically oxidize glucose as glucose oxidase (GOx)-mimicking. The resultant hydrogen peroxide can quench the photoluminescence (PL) signal of QDs in the microsphere core. Therefore the nanosensor based on the decrease of the PL intensity of QDs was established for the glucose detection. The linear range for glucose was in the range of 5-200 μM with a detection limit (3σ) of 1.32 μM.
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Ma
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China.
authors.forename: Ziping
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun 130022, PR China.
authors.forename: Xinyan
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China. Electronic address: suxg@jlu.edu.cn.
authors.forename: Xingguang
authors.initials: X
authors.lastname: Su
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D005947:Glucose / Q000032:analysis*; D006046:Gold / Q000737:chemistry*; D006801:Humans; D053768:Metal Nanoparticles / Q000737:chemistry*; D008863:Microspheres; D016062:Porosity; D045663:Quantum Dots / Q000737:chemistry*
chemical_list: D006046:Gold; D005947:Glucose
keywords: Au nanoparticles; CdTe quantum dots; Enzyme-mimic nanosensor; Silica mesoporous microspheres