The article presents the results of analysis of Raman scattering spectra of non-conjugated and bioconjugated CdSe/ZnS core-shell quantum dots (QDs). Commercial CdSe/ZnS QDs used covered by polymer are characterized by color emission with the maxima at 605-610 nm (2.03-2.05 eV). The bioconjugation process is performed to biomolecules-the antihuman Interleukin 10 (IL10) antibodies (mab). Raman scattering spectra measured at room temperature with excitation by a He-Ne laser line (632.8 nm) demonstrate two groups of peaks: (1) related to the Si substrate at 230-460, 522, 610, 670, 940-1040 cm(-1) and (2) to the PEG polymer on the QD surface in the range of 837-3320 cm(-1). It is revealed that the CdSe/ZnS QD bioconjugation to the antihuman Interleukin 10 antibodies is accompanied with the dramatic changes in the intensity of the Raman lines of both types: the intensity of the Si related line increases six- or ten-fold, but the intensity of the polymer related line decreases ten-fold. The models explaining the mentioned effects in Raman scattering spectra have been discussed.
Amorphous lead nanostructures have been obtained by ionic interchange and reduction in faujasite zeolite X (F9) matrix. The size and amorphous nature of the lead nanostructures was determined by transmission electron microscopy and the chemical composition by energy-dispersive X-ray spectroscopy measurements. The Raman spectrum of the lead species in the zeolite X displays a peak at 112 cm−1 which has been assigned to Pb–Pb vibration modes in the amorphous nanostructures. The structure and vibrational properties of Pbn clusters, for n = 2 to 20, were determined using Hartree–Fock and density functional theory. The optimized Pbn structures present a vibration mode at a frequency around that observed in the Raman spectrum of the amorphous lead nanostructures.
Thin PMMA films have been studied extensively for their potential applications as membranes, microlithography and optical applications. PMMA has been recently use like gate dielectric film in OTFT. In this paper we present the structural and electrical characteristics of isotactic PMMA (i‐PMMA) thin films prepared by spin coating depositions. The electrical characterization was done using a simple capacitive structure to observe current density across dielectric film and voltage breakdown. The i‐PMMA films possess low current density across dielectric (1 × 10−8 A/cm2) and the breakdown voltage is higher than 100 V.
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