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In this paper, reduced graphene oxide/gold nanoparticle/Nafion (rGO/AuNP/Nafion) modified electrode was fabricated through in-situ synthesis and used for determination of copper ions in strong salt electrolyte (0.5M NaCl) by differential pulse anodic stripping voltammetry (DPASV). This in-situ synthesis procedure was based on the ion-exchange and electrochemical reduction. The use of rGO provided...
Vanadium (V)-doped tin oxide (SnO2) one-dimensional porous nanofibers (PNFs) were fabricated for the hydrogen detection application. V-doping changes the distances of different facets of the SnO2 crystal in different roles, and therefore deform or distort the SnO2 structure. The modulation effects of V4+ and V5+ on hydrogen detecting performance were discussed. With a suitable amount of V-doping,...
A signal-switchable electrochemiluminescence (ECL) aptasensor was presented for sensitive prostate specific antigen (PSA) assay using ferrocene-graphene sheets (Fc-GNs) for high-efficiency quenching of ECL from Au nanoparticles functionalized cadmium sulfide flower-like three dimensional (3D) assemblies (Au-CdS flower-like 3D assemblies). Au-CdS flower-like 3D assemblies were synthesized and employed...
A new method of capillary electrophoresis (CE) coupled with tris(2, 2′-bipyridyl) ruthenium(II) electrochemiluminescence (ECL) detection has been developed to detect four local anesthetics procainamide (PAH), tetracaine (TCH), proparacaine (PCH) and cinchocaine (CIN) simultaneously. An europium (III)-doped prussian blue analogue film (Eu-PB) modified platinum electrode was prepared and applied to...
This work describes a novel electrochemiluminescence aptasensor for highly sensitive detection of platelet-derived growth factor BB (PDGF-BB) using aptamer functionalized CdS quantum dots–polyamidoamine as probe (CdS QDs–PAMAM–Apt). CdS QDs–PAMAM nanocomposites were synthesized by one-pot synthesis in methanol. The prepared nanocomposites were linked with the NH2–aptamer 2 (Apt2) of PDGF-BB to form...
A sandwich-type luminol electrochemiluminescence (ECL) aptasensor for highly sensitive and selective detection of platelet-derived growth factor BB (PDGF-BB) is fabricated. For this proposed ECL aptasensor, a multilayered AuNPs-electrochemically reduced graphene (AuNPs-EG) nanocomposite film was formed on the GCE surface as the base of the aptasensor through a co-electrodeposition method. The AuNPs-EG...
A novel artificial receptor 1 containing the indolocarbazole-NH moieties as the recognition sites exhibited high selectivity and sensitivity toward F− over other typical anionic species in DMSO solution. Upon addition of F− into the solution, receptor 1 showed a remarkable ratiometric shift of the fluorescence maximum from 535 to 590nm, and also a prominent color change from light yellow to orange,...
By retaining the quadrapyridyl receptor of polypyridylhexaazatriphenylene (a Cd 2+ sensor reported by us) and extending its chromophoric group with pyrene, a chemical sensor (1) was designed and synthesized in this work. This sensor exhibit selective off-on fluorescence response to Cd 2+ over other metal ions, and the detection limit is as low as 0.02μM. The Cd 2+ sensing of...
A signal amplification strategy based on antibody–gold nanoparticle–DNAzyme assembly in capillary electrophoresis based chemiluminescent immunoassays (CE-CLIA) was developed. In this CE-CLIA, antibody–AuNP–G-quadruplex/hemin was incubated with limited amount of antigen, and the formed immunocomplex and unreacted antibody–AuNP–G-quadruplex/hemin were then separated by CE and detected by CL. Due to...
Two hexaazatriphenylene (HAT) derivatives, 2,3,6,7-tetramethyl-10,11-di(pyridin-2-yl)dipyrazino[2,3-f:2',3'-h]quinoxaline (1) and 2,3-dimethyl-6,7,10,11-tetra(pyridin-2-yl)dipyrazino[2,3-f:2',3'-h]quinoxaline (2), were designed and synthesized. Both 1 and 2 exhibited high off–on fluorescent selectivity for Cd 2+ over many other metal ions, and the detection limits were determined to be 0.6...
A label-free non-aggregation colorimetric sensor has been designed for the detection of Cu 2+ , based on Cu 2+ catalyzing etching of gold nanorods (AuNRs) along longitudinal axis induced by dissolve oxygen in the presence of S 2 O 32− , which caused the aspect ratio (length/width) of AuNRs to decrease and the color of the solution to distinctly change. The linear...
Fe 3+ can catalyze H 2 O 2 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 Fe...
A multifunctional Ag nanoparticles (AgNPs)–polydopamine (Pdop)@graphene (Gr) composite was prepared by a simple and mild procedure. Gr was easily coated with Pdop at room temperature and then AgNPs was deposited by mildly stirring. The nanocomposite was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). Guanine and adenine as model moleculars were employed...
Two C 2 -symmetrical hexaazatriphenylene (HAT) derivatives, 2,3-diphenyl-6,7,10,11-tetra(pyridin-2-yl)dipyrazino[2,3-f:2′,3′-h]quinoxaline (1) and 2,3,6,7-tetraphenyl-10,11-di(pyridin-2-yl)dipyrazino[2,3-f:2′,3′-h]quinoxaline (2), were designed and synthesized by the condensation reaction of 1,2-diamines and 1,2-diketones. Both compounds 1 and 2 exhibit sensitive, ratiometric and colorimetric...
The CdS/TiO 2 –fluorescein isothiocyanate (FITC) luminescent nanoparticles (CdS/TiO 2 –FITC) with the particle size of 20nm have been synthesized by sol–gel method. CdS/TiO 2 –FITC could emit the fluorescence of both FITC and CdS/TiO 2 . The fluorescence resonance energy transfer (FRET) occurred between the donor CdS/TiO 2 and the acceptor FITC in the CdS/TiO...
A new ditopic ion pair receptor 1 containing two biindole moieties and a bis-benzocrown ether unit shows a remarkable color switching (ON- and -OFF) function induced by anion (F − ) and cation (K + ) recognition. The ditopic receptor 1 binds in a cooperative fashion to HSO 4− in the presence of 1·K + and acts as a selective ditopic receptor to recognize ion pairs...
A novel sol–gel-coated ionic liquid-based ([AMIM][N(SO 2 CF 3 ) 2 ]–OH-TSO) fiber was successfully applied for the determination of phthalate esters (PAEs) in agricultural plastic films by ultrasonic extraction (UE) combined with solid phase microextraction–gas chromatography (SPME–GC) due to its high thermal stability, specific selectivity and extraction efficiency. The extractant...
A new suspension array technology is proposed for the simultaneous quantitative determination of five antibiotics—tylosin, tetracycline, gentamicin, streptomycin, and chloramphenicol in milk. A novel treatment of milk samples for suspension array with diethyl ether was performed which greatly reduced the interference of the disturbing components in milk on the reaction results with no significant...
Natural phenazines in secondary metabolites of bacteria have been receiving increasing attention in recent years due to their potential usage as antibiotics. In the present study, a rapid and reliable capillary zone electrophoresis (CZE) method was developed and validated for monitoring for the first time dynamic phenazine-1-carboxylic acid (PCA) and the 2-hydroxyphenazine (2-OH-PHZ) production of...
In this paper, 3.5-generation polyamidoamine dendrimers (3.5G-D)-porphyrin (P) dual luminescence molecule (3.5G-D-P) was developed as a new phosphorescence-labeling reagent. Meanwhile, the room temperature phosphorescence (RTP) characteristics of 3.5G-D-P and its product of labeling triticum vulgaris lectin (WGA) on the surface of polyamide membrane (PAM) were studied. Results showed that in the presence...
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