TY - JOUR
T1 - Synthesis of N-acetyl-L-cysteine capped Mn:doped CdS quantum dots for quantitative detection of copper ions
AU - Yang, Xiupei
AU - Jia, Zhihui
AU - Cheng, Xiumei
AU - Luo, Na
AU - Choi, Martin M.F.
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China ( 21777130 , 21277109 ), the Sichuan Province Science and Technology Support Plan Project ( 2015SZ0204 ), and the Fundamental Research Funds of China West Normal University ( 416390 ).
PY - 2018/6/15
Y1 - 2018/6/15
N2 - In this work, a new assembled copper ions sensor based on the Mn metal-enhanced fluorescence of N-acetyl-L-cysteine protected CdS quantum dots (NAC-Mn:CdS QDs) was developed. The NAC and Mn:CdS QDs nanoparticles were assembled into NAC-Mn:CdS QDs complexes through the formation of Cd–S and Mn–S bonds. As compared to NAC capped CdS QDs, higher fluorescence quantum yields of NAC-Mn:CdS QDs was observed, which is attributed to the surface plasmon resonance of Mn metal. In addition, the fluorescence intensity of as-formed complexes weakened in the presence of copper ions. The decrease in fluorescence intensity presented a linear relationship with copper ions concentration in the range from 0.16–3.36 μM with a detection limit of 0.041 μM. The characterization of as-formed QDs was analyzed by photoluminescence (PL), ultra violet-visible (UV–vis), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive spectroscopy (EDS) respectively. Furthermore, the recoveries and relative standard deviations of Cu2+ spiked in real water samples for the intra-day and inter-day analyses were 88.20–117.90, 95.20–109.90, 0.80–5.80 and 1.20–3.20%, respectively. Such a metal-enhanced QDs fluorescence system may have promising application in chemical and biological sensors.
AB - In this work, a new assembled copper ions sensor based on the Mn metal-enhanced fluorescence of N-acetyl-L-cysteine protected CdS quantum dots (NAC-Mn:CdS QDs) was developed. The NAC and Mn:CdS QDs nanoparticles were assembled into NAC-Mn:CdS QDs complexes through the formation of Cd–S and Mn–S bonds. As compared to NAC capped CdS QDs, higher fluorescence quantum yields of NAC-Mn:CdS QDs was observed, which is attributed to the surface plasmon resonance of Mn metal. In addition, the fluorescence intensity of as-formed complexes weakened in the presence of copper ions. The decrease in fluorescence intensity presented a linear relationship with copper ions concentration in the range from 0.16–3.36 μM with a detection limit of 0.041 μM. The characterization of as-formed QDs was analyzed by photoluminescence (PL), ultra violet-visible (UV–vis), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive spectroscopy (EDS) respectively. Furthermore, the recoveries and relative standard deviations of Cu2+ spiked in real water samples for the intra-day and inter-day analyses were 88.20–117.90, 95.20–109.90, 0.80–5.80 and 1.20–3.20%, respectively. Such a metal-enhanced QDs fluorescence system may have promising application in chemical and biological sensors.
KW - Chemical sensor
KW - Copper ions
KW - Fluorescence
KW - Quantum dots
UR - http://www.scopus.com/inward/record.url?scp=85045405222&partnerID=8YFLogxK
U2 - 10.1016/j.saa.2018.04.003
DO - 10.1016/j.saa.2018.04.003
M3 - Journal article
C2 - 29655131
AN - SCOPUS:85045405222
SN - 1386-1425
VL - 199
SP - 455
EP - 461
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ER -