Detection of hydrofluoric acid by a SiO2 sol-gel coating fiber-optic probe based on reflection-based localized surface plasmon resonance.

A novel fiber-optic probe based on reflection-based localized surface plasmon resonance (LSPR) was developed to quantify the concentration of hydrofluoric acid (HF) in aqueous solutions. The LSPR sensor was constructed with a gold nanoparticle-modified PMMA fiber, integrated with a SiO(2) sol-gel coating. This fiber-sensor was utilized to assess the relationship between HF concentration and SiO(2) sol-gel layer etching reduction.

Determination of cyclic GMP concentration using a gold nanoparticle-modified optical fiber.

Guanosine 3',5'-cyclic monophosphate (cGMP) produced from guanosine triphosphate (GTP) via soluble or particulate guanylyl cyclase (GC) is an important second messenger for signal transduction within cells. The currently used methods of measuring cGMP including radioimmunoassay and enzyme immunoassay involve the use of radioisotopes or tracers. To develop a cGMP assay that is label-free, non-radioactive, able to detect cGMP directly, and highly specific and sensitive, we used a gold nanoparticle-modified optical fiber (GNOF) conjugated with anti-cGMP antiserum to determine cGMP concentration based on localized surface plasmon resonance (LSPR).

The assessment for sensitivity of a NO2 gas sensor with ZnGa2O4/ZnO core-shell nanowires--a novel approach.

The application of novel core-shell nanowires composed of ZnGa2O4/ZnO to improve the sensitivity of NO2 gas sensors is demonstrated in this study. The growth of ZnGa2O4/ZnO core-shell nanowires is performed by reactive evaporation on patterned ZnO:Ga/SiO2/Si templates at 600 °C. This is to form the homogeneous structure of the sensors investigated in this report to assess their sensitivity in terms of NO2 detection.

Detection of cadmium by a fiber-optic biosensor based on localized surface plasmon resonance.

A novel transmission-based localized surface plasmon resonance (LSPR) fiber-optic probe has been developed to determine the heavy metal cadmium ion (Cd(II)) concentration. The LSPR sensor was constructed by immobilizing phytochelatins (PCs), (gammaGlc-Cys)(8)-Gly, onto gold nanoparticle-modified optical fiber (NM(Au)OF). The optimal immobilizing conditions of PCs on to the NM(Au)OF are 71.

Using Monoclonal Antibody to Determine Lead Ions with a Localized Surface Plasmon Resonance Fiber-optic Biosensor.

A novel reflection-based localized surface plasmon resonance (LSPR) fiber-optic probe has been developed to determine the heavy metal lead ion concentration. Monoclonal antibody as the detecting probe containing massive amino groups to capture Pb(II)-chelate complexes was immobilized onto gold nanoparticle-modified optical fiber (NMAuOF). The optimal immobilizing conditions of monoclonal antibody on to the NMAuOF are 189 μg/mL in pH7.

Determination of organophosphorous pesticides by a novel biosensor based on localized surface plasmon resonance.

Liquid and gas chromatography are commonly used to measure organophosphorus pesticides. However, these methods are relatively time consuming and require a tedious sample pretreatment. Here, we applied the localized surface plasmon resonance (LSPR) of gold nanoparticles covalently coupled with acetylcholinesterase (AChE) to create a biosensor for detecting an example of serial signals responding to paraoxon in the range of 1-100 ppb by an AChE modified LSPR sensor immersing in a 0.