TY - JOUR
T1 - Synthesis and optical properties of cysteamine-capped ZnS quantum dots for aflatoxin quantification
AU - Yaraki, Mohammad Tavakkoli
AU - Tayebi, Mahnoush
AU - Ahmadieh, Mahnaz
AU - Tahriri, Mohammadreza
AU - Vashaee, Daryoosh
AU - Tayebi, Lobat
PY - 2017/1/5
Y1 - 2017/1/5
N2 - Water-soluble cysteamine-capped ZnS quantum dots (QDs) are designed to serve as a photodetector for a dangerous group of carcinogens called aflatoxins. ZnS QDs are synthesized by growth in a poly(vinyl alcohol) matrix using the precipitation method. The prepared QDs are characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Our characterization shows that these ZnS QDs have a 1.77 nm crystalline size, cubic zinc blende structure and spherical morphology with a diameter less than 10 nm. Photoluminescence spectroscopy (PL) is performed in the presence of a standard solution of aflatoxins (B1, B2, G1 and G2 with a ratio of 5:1:5:1) at various concentrations, in order to determine the efficacy of a ZnS QD-based aflatoxin detection method. Two PL emission peaks located at 440 nm and 467 nm are observed whose intensities are enhanced by increasing the concentration of total aflatoxin. PL variations in the range of aflatoxin concentrations studied here (2.4 ppb–48 ppb) are best described by a Langmuir-type equation. The limit of detection is calculated to be 0.05 ppb, well below the lowest international contamination allowance in food products.
AB - Water-soluble cysteamine-capped ZnS quantum dots (QDs) are designed to serve as a photodetector for a dangerous group of carcinogens called aflatoxins. ZnS QDs are synthesized by growth in a poly(vinyl alcohol) matrix using the precipitation method. The prepared QDs are characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Our characterization shows that these ZnS QDs have a 1.77 nm crystalline size, cubic zinc blende structure and spherical morphology with a diameter less than 10 nm. Photoluminescence spectroscopy (PL) is performed in the presence of a standard solution of aflatoxins (B1, B2, G1 and G2 with a ratio of 5:1:5:1) at various concentrations, in order to determine the efficacy of a ZnS QD-based aflatoxin detection method. Two PL emission peaks located at 440 nm and 467 nm are observed whose intensities are enhanced by increasing the concentration of total aflatoxin. PL variations in the range of aflatoxin concentrations studied here (2.4 ppb–48 ppb) are best described by a Langmuir-type equation. The limit of detection is calculated to be 0.05 ppb, well below the lowest international contamination allowance in food products.
KW - ZnS QDs
KW - Aflatoxin
KW - Cysteamine
KW - Photoluminescence
KW - Synthesis
U2 - 10.1016/j.jallcom.2016.08.158
DO - 10.1016/j.jallcom.2016.08.158
M3 - Article
SN - 0925-8388
VL - 690
SP - 749
EP - 758
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -