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Huang Y.-Q.,Zhangzhou Normal University | Huang Y.-Q.,Fujian Medical University | Cai P.-Y.,Zhangzhou Normal University | Liu J.-M.,Zhangzhou Normal University | And 5 more authors.
RSC Advances | Year: 2014

CdTe-Cys-QDs with a grain diameter of 10.2 nm were synthesized by modifying CdTe quantum dots (QDs) using cysteine (Cys), and their structure was characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and fluorescence spectroscopy. The CdTe-Cys-QDs could emit a strong and stable room temperature phosphorescence (RTP) on the polyamide membrane (PAM), and they were oxidized by H2O2 to form CdTe-Cys-QDs', resulting in increasing defects on the surface of the CdTe-Cys-QDs and the RTP signals to quench. More interestingly, As(v) can catalyze H2O2 to oxidize the CdTe-Cys-QDs, to quench the RTP signal of the system sharply, showing that the catalyzing reaction has a signal amplification effect on the RTP of the system. Based on the above phenomenom, a new CdTe-Cys-QDs phosphorescence sensor for the determination of trace As(v) has been developed. This simple, rapid and sensitive (the limit of detection (LOD) is 2.1 × 10-18 g mL-1.) CdTe-Cys-QDs phosphorescence sensor has been utilized to detect As(v) in human hair, tea and water samples, and the results are consistent with those obtained by atomic absorption spectrometry (AAS). Meanwhile, the morphological characterization changes of the CdTe-QDs and CdTe-Cys-QDs were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) spectra and fluorescence spectroscopy. Furthermore, the sensing mechanism for the determination of As(v) by CdTe-Cys-QDs phosphorescence sensor was also discussed. © 2014 The Royal Society of Chemistry.


Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | Lin L.-P.,Zhangzhou Normal College | And 3 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

Dopamine (DA) could reduce Ag+ to Ag on the surface of gold nanorods (AuNRs) to form Au core-Ag shell nanorods (Au@AgNRs) in AuNRs-Ag+-DA system, which caused dielectric function to change, the aspect ratio of AuNRs to decrease and longitudinal plasmon absorption band (LPAB) of AuNRs to blue shift (Δλ), as well as the color of the solution to change obviously. Thus, a non-aggregation colorimetric sensor for rapid determination of DA was developed based on the linear relationship between Δλ and the concentration of DA. The responsive, simple, sensitive and selective colorimetric sensor has been successfully applied to the detection of DA in serum, showing its great practicality. At the same time, the structures of AuNRs and Au@Ag NRs were characterized by transmission electron microscope (TEM). Meanwhile, the sensing mechanism for the detection of DA has been discussed. © 2012 Elsevier B.V. All rights reserved.


Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Jiao L.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | And 3 more authors.
Talanta | Year: 2013

Fe3+ can catalyze H2O2 to oxidize along on the longitudinal axis of gold nanorods (AuNRs), which caused the aspect ratio of AuNRs to decrease, longitudinal plasmon absorption band (LPAB) of AuNRs to blueshift (Δλ) and the color of the solution to change obviously. Thus, a rapid response and highly sensitive non-aggregation colorimetric sensor for the determination of Fe3+ has been developed based on the signal amplification effect of catalyzing H2O2 to oxidize AuNRs. This simple and selective sensor with a wide linear range of 0.20-30.00 μM has been utilized to detect Fe3+ in blood samples, and the results consisted with those obtained by inductively coupled plasma-mass spectroscopy (ICP-MS). Simultaneously, the mechanism of colorimetric sensor for the detection of Fe3+ was also discussed. © 2013 Elsevier B.V.


Liu J.-M.,Zhangzhou Normal University | Jiao L.,Zhangzhou Normal University | Cui M.-L.,Zhangzhou Normal University | Lin L.-P.,Zhangzhou Normal University | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

I- could accelerate the selective etching along longitudinal direction of gold nanorods (AuNRs) induced by Fe3+ in HCl medium, which decreased the aspect ratio (length/width) of AuNRs, and thus the longitudinal surface plasmon resonance (LSPR) absorption peaks of AuNRs blue shifted (Δλ = λ0 - λ), the corresponding absorbance decreased (ΔA = A0 - A), and the color of the solution obviously changed. Therefore, a non-aggregation AuNRs colorimetric sensor for the detection of I- was developed. The proposed colorimetric sensor is responsive, simple, selective and sensitive with the limit of quantization (LOQ) of 8.8 × 10-8 M. The highly accurate sensor has been used to determine the content of I- in table salt samples with the results consistent with those obtained by inductively coupled plasma-mass spectroscopy (ICP-MS). Moreover, the morphological changes of AuNRs during the etching procedure were characterized by high resolution transmission electron microscopy (HRTEM) and the sensing mechanism for I - detection was also discussed. © 2013 Elsevier B.V.


Liu J.-M.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Lin L.-P.,Zhangzhou Normal College | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

Polyamide membrane-wheat germ agglutinin-poly vinyl alcohol-affinity adsorption imprinting (abbreviated to PAM-WGA-PVA-AAI) was prepared using alkaline phosphatase (AP) as the template. The cavity in PAM-WGA-PVA-AAI not only matched with AP very well, but also had a sensitive response to AP. The Morin-SiO2-AbAP was obtained using Morin-SiO2 to label AbAP (goat anti human AP antibody). When Ab AP-Morin-SiO2 was added to PAM-WGA-PVA-AAI, PAM-AP-Ab AP-Morin-SiO2 formed by the immunoreaction between Ab AP and AP in PAM-WGA-PVA-AAI due to the affinity between Ab AP and AP was stronger than that between AP and WGA. The product could emit room temperature phosphorescence (RTP) because of the heavy atom effect of Pb2+. Motivated by the sensitive response of cavity in PAM-WGA-PVA-AAI to AP, a new PAM-WGA-PVA-AAI phosphorescence sensor for determination of trace AP and prediction of human diseases has been developed using PAM-WGA-PVA-AAI technique. The proposed sensor was sensitive (the detection limit (DL): 0.18 ag spot-1, corresponding concentration: 7.2 × 10-17 g mL-1 or 7.2 × 10-19 mol L-1), simple, rapid and highly selective, and it has been applied to the determination of trace AP in human serum and the forecast of human diseases, with the results agreeing well with those obtained by enzyme-linked immunoassay (ELISA). Meanwhile, the mechanism of this PAM-WGA-PVA-AAI phosphorescence sensor was discussed also. © 2013 Elsevier B.V.

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