No abstract

ray irradiation effects on ferroelectric properties of (Bi 0.85 Pr 0.15)(Fe 0.95 Mn 0.05)O 3 (BPFMO) thin films are investigated by pizeoresponse force microscopy and polarization-voltage hysteresis measurements. The irradiated BPFMO thin-film capacitors show reduced polarizations and imprinted hysteresis loops. The loss of nonvolatile polarization increases with the decrease of polarization values prior to the irradiation and the imprint of hysteresis loops depends on the direction of polarization. These are discussed in terms of separation of-ray-excited electron-hole pairs by the depolarization field and subsequent charge trapping and aggregation on charged domain walls in BPFMO thin films.

Bisphenol A-based epoxy acrylate (BABEA), a commercial ultraviolet (UV)-curable material, was introduced as a new manufacturing material for facile fabrication of epoxy-functionalized micro-zone plates through UV-initiated copolymerization using glycidyl methacrylate (GMA) as the functional monomer. The poly (BABEA-co-GMA) was highly transparent in visible range while highly opaque when the wavelength is less than 295 nm, and of high replication fidelity. X-ray photoelectron spectroscope (XPS) results indicated the existence of epoxy groups on the surface of the poly (BABEA-co-GMA), which allowed for binding protein through an epoxy-amino group reaction. A fabrication procedure was proposed for manufacturing BABEA based epoxyfunctionalized micro-zone plates. The fabrication procedure was very simple; obviating the need of micromachining equipments, wet etching or imprinting techniques. To evaluate the BABEA-based epoxy-functionalized micro-zone plates, a-fetoprotein (AFP) was immobilized onto the capture zone for chemiluminescent (CL) detection in a noncompetitive immune response format. The proposed AFP immunoaffinity micro-zone plate was demonstrated as a low cost, flexible, homogeneous, and stable assay for afetoprotein (AFP).