Nanoporous TiO(2)/Polyion Thin-Film-Coated Long-Period Grating Sensors for the Direct Measurement of Low-Molecular-Weight Analytes.
Summary of "Nanoporous TiO(2)/Polyion Thin-Film-Coated Long-Period Grating Sensors for the Direct Measurement of Low-Molecular-Weight Analytes."
We present novel nanoporous TiO(2)/polyion thin-film-coated long-period fiber grating (LPFG) sensors for the direct measurement of low-molecular-weight chemicals by monitoring the resonance wavelength shift. The hybrid overlay films are prepared by a simple layer-by-layer deposition approach, which is mainly based on the electrostatic interaction of TiO(2) nanoparticles and polyions. By the alternate immersion of LPFG into dispersions of TiO(2) nanoparticles and polyions, respectively, the so-formed TiO(2)/polyion thin film exhibits a unique nanoporous internal structure and has a relative higher refractive index than LPFG cladding. In particular, the porosity of the thin film reduces the diffusion coefficient and enhances the permeability retention of low-molecular-weight analytes within the porous film. The increases in the refractive index of the LPFG overlay results in a distinguished modulation of the resonance wavelength. Therefore, the detection sensitivity of LPFG sensors has been greatly improved, according to theoretical simulation. After the structure of the TiO(2)/polyion thin film was optimized, glucose solutions as an example with a low concentration of 10(-7) M was easily detected and monitored at room temperature.
Affiliation
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, PR China.
Journal Details
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
Pages: 8814-21
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22594626
- DOI: http://dx.doi.org/10.1021/la301445h
Medical and Biotech [MESH] Definitions
X-ray Film
A film base coated with an emulsion designed for use with x-rays.
Pleura
The thin serous membrane enveloping the lungs (LUNG) and lining the THORACIC CAVITY. Pleura consist of two layers, the inner visceral pleura lying next to the pulmonary parenchyma and the outer parietal pleura. Between the two layers is the PLEURAL CAVITY which contains a thin film of liquid.
Film Dosimetry
Use of a device (film badge) for measuring exposure of individuals to radiation. It is usually made of metal, plastic, or paper and loaded with one or more pieces of x-ray film.
Dental Pellicle
A thin protein film on the surface of DENTAL ENAMEL. It is widely believed to result from the selective adsorption of precursor proteins present in SALIVA onto tooth surfaces, and to reduce microbial adherence to the TEETH.
Radiometry
The measurement of radiation by photography, as in x-ray film and film badge, by Geiger-Mueller tube, and by SCINTILLATION COUNTING.
PubMed Articles
Vertically aligned nanowires and highly uniform nanoporous array thin films of PbTiO(3) are synthesized by varying anodic oxidation conditions of Ti foil followed by hydrothermal reaction in an aqueou...
Spatially patterned ion beam implantation of 190 keV Co(+) ions into a SiO(2) thin film on a Si substrate has been achieved by using nanoporous anodic aluminum oxide with a pore diameter of 125 nm as...
Nanoporous thin films with controllable nanopores processed from vertically aligned nanocomposites.
Porous thin films with ordered nanopores have been processed by thermal treatment on vertically aligned nanocomposites (VAN), e.g., (BiFeO(3))(0.5):(Sm(2)O(3))(0.5) VAN thin films. Uniformly distribut...
We show that the morphology of a thin polymer film spin coated directly on to a topographically patterned substrate is strongly influenced by the wettability of the substrate, in addition to other wel...
Patterned nanoporous gold as an effective SERS template.
We demonstrate large area two-dimensional arrays of patterned nanoporous gold for use as easy-to-fabricate, cost-effective, and stable surface enhanced Raman scattering (SERS) templates. Using a simpl...
Clinical Trials
A Study to Assess the Bioequivalence of Famotidine Chewable Tablets and Film-Coated Tablets
This study will determine whether the chewable tablet (CT) formulation of famotidine taken with and without water is bioequivalent to the film coated tablet (FCT) formulation.
Paroxetine Hydrochloride 40 mg Tablets Under Fed Conditions
The objective of this study is to compare the rate and extent of absorption of paroxetine hydrochloride 40 mg film-coated tablets (test) and Paxil® (reference) administered as 1 x 40 mg f...
Bioequivalence Study: 3 mg Estradiol Valerate (EV) With and Without Levomefolate Calcium
Investigation of the bioequivalence (BE) of Estradiol Valerate (EV) after administration of one film-coated tablet containing 3 mg Estradiol Valerate and 0.451 mg Levomefolate calcium as c...
Investigation of the bioequivalence (BE) of Estradiol Valerate (EV) and Dienogest (DNG) after administration of one film-coated tablet containing 2 mg Estradiol Valerate, 3 mg Dienogest an...
The purpose of this study is to demonstrate the relative bioavailability of Bicalutamide 50 mg tablet and Casodex following a 50 mg dose in healthy subjects under fed conditions.
