Electrochemical Activity Studies of Glucose Oxidase (GOx)‐Based and Pyranose Oxidase (POx)‐Based Electrodes in Mesoporous Carbon: Toward Biosensor and Biofuel Cell Applications

A simple study using a fixed amount of mesoporous carbon (MSU‐F‐C) was performed for the comparison of pyranose oxidase (POx) and glucose oxidase (GOx) in their electrochemical performance under biosensor and biofuel cell operating modes. Even though the ratio of POx to GOx in the glucose oxidation activity per unit weight of MSU‐F‐C was 0.35, the ratios of POx to GOx in sensitivity and power density were reversed to be 6.2 and 1.4, respectively. POx with broad substrate specificity and an option of large scale production using recombinant E. coli has a great potential for various electrochemical applications, including biofuel cells.     

Asymptotic stability of the semilinear wave equation with boundary damping and source term

In this paper, we consider the semilinear wave equation with boundary conditions. This work is devoted to prove the uniform decay rates of the wave equation with boundary, without imposing any restrictive growth near-zero assumption on the damping term.     

A structural investigation of tris(ethyl acetoacetate)aluminium (III)

Aluminium tris(ethyl acetoacetate), Al(C₆H₉O₃)₃ has been prepared and characterized by means of ¹H and ¹³C nuclear magnetic resonance spectroscopy, scanning electron microscopy and X-ray powder diffraction (XRPD). It was determined that two stereoisomeric complexes can be distinguished in the solution: meridional and facial. The crystal structure of Al(C₆H₉O₃)₃ has been determined from XRPD data. The compound crystallizes in the monoclinic space group P2₁/n.     

The optical influence of Na on Cu2ZnSnSe4 films deposited with Na-containing sol–gel precursor

A novel Na-containing precursor solution is presented to investigate the sodium influences on Cu₂ZnSnSe₄ (CZTSe) absorbers grown on Na-free substrates. With higher sodium incorporation, some delicate change in secondary phase Cu₂SnSe₃ was detected and its influence on the surface valence states was given by X-ray photoelectron spectroscopy analyses. It is found that the band gap significantly increased with nominal addition of Na, while the impurity introduced by excess incorporation would restrain further broadening. This method may probably assist to form a suitable CZTSe film directly on flexible substrates other than soda-lime glass.     

Resonance characteristics of localized plasmonic structures with periodic ZnO nano-patterns

Localized plasmonic structures with the periodic ZnO nano-patterns are demonstrated to increase the sensing characteristics of plasmonic sensor. The ZnO nano-patterns with 30 and 50 nm thicknesses are formed on the Au thin film of 50 nm, which have the periodic nano-patterns of 300 nm. Localized plasmonic structures are optimized using the three-dimensional finite-difference time-domain method as a function of incident angle for the width and thickness of the ZnO nano-structures. Localized plasmonic structures with the periodic ZnO nano-holes are fabricated using the double exposure technique by laser interference lithography. The measured resonance angles of 47.5° and 54° are obtained in the localized plasmonic structures with the periodic ZnO nano-patterns of 30 and 50 nm thicknesses, respectively.