Monolithic integration of an AlGaN/GaN metalinsulator field-effect transistor with an ultra-low voltage-drop diode for self-protection

In this paper,we present a monolithic integration of a self-protected AlGaN/GaN metal-insulator field-effect transistor(MISFET).An integrated field-controlled diode on the drain side of the AlGaN/GaN MISFET features a selfprotected function for a reverse bias.This diode takes advantage of the recessed-barrier enhancement-mode technique to realize an ultra-low voltage drop and a low turn-ON voltage.In the smart monolithic integration,this integrated diode can block a reverse bias(> 70 V/μm) and suppress the leakage current(< 5 × 10-11 A/mm).Compared with conventional monolithic integration,the numerical results show that the MISFET integrated with a field-controlled diode leads to a good performance for smart power integration.And the power loss is lower than 50% in conduction without forward current degeneration.     

In situ IR study of dimethyl oxalate hydrogenation to ethylene glycol over Cu/SiO2 catalyst

The mechanism of dimethyl oxalate hydrogenation to ethylene glycol over Cu/SiO2 catalyst was investigated by in situ Fourier transform infrared(FTIR)spectroscopy.It was found that dimethyl oxalate and methyl glycolate proceeded via dissociative adsorption on Cu/SiO2 catalyst,and four main intermediates,CH3OC(O)(O)C-M(1655 cm-1),M-C(O)(O)C-M(1618 cm-1),HOCH2(O)C-M(1682 cm-1)and CH3O-M(2924-2926 cm-1),were identified during the reaction.It was concluded that dimethyl oxalate hydrogenation to ethylene glycol mainly proceeded along the route:dimethyl oxalate →CH3OC(O)(O)C-M→ methyl glycolate →HOCH2(O)C-M→ ethylene glycol.Finally a schematic reaction network was proposed.     

Quantum Theory of Two-Photon Ghost Interference

In this paper, we study two-photon ghost interference with the approach of photon quantum theory, and calculate the coincidence counts of D ₁ and D ₁ detectors. With specific attention to the two-photon interference experiment carried out by Milena D’Angelo et al. (Phys. Rev. Lett. 87:013602, 2001), and find the theoretical result is accordance with experiment data.     

Charge-transfer complex coupled between polymer and H-aggregate molecular crystals

Crystal needles of N,N′-bis(1-ethylpropyl)-3,4,9,10-perylenebis(dicarboximide) (EPPTC) are produced through p-stacking and are embedded in the thin film of poly(9,9-din-hexylfluorenyl-2,7-diyl) (PFO) when the blend solution of EPPTC and PFO in p-xylene is spin-coated onto a glass substrate. Charge transfer (CT) complex is resolved from the spectroscopic response of the blend film, which is generated only when the PFO molecules are excited. Thus, the PFO molecules are specified as donors and the H-aggregated EPPTC as acceptors in the formation of CT state (CTS). The emission resulting from the CTS in the red is further recognized by its much longer lifetime than both the intrinsic emission of the individual EPPTC molecules and that of their pure aggregates. Near-field analysis verifies that the CTS form on the boundary between the PFO and the crystal phases. The CT exciton forms by bounding the hole left on HOMO of the donor (PFO) and the indirectly transferred electron to the H-aggregate state of EPPTC, which transits back to the ground state by emitting a photon at about 650 nm. This introduces special physics in the heterojunctions that are coupled with the H-aggregates and mechanisms important for the design of organic photovoltaic devices. © 2013 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013     

Preparation of 17β‐estradiol surface molecularly imprinted polymers and their application to the analysis of biological samples

17β‐Estradiol (E2) surface molecularly imprinted polymers have been prepared using functionalized monodispersed poly(glycidyl methacrylate‐co‐ethylene dimethacrylate) beads as a support. The resulting polymers were found to be uniform in size (5 μm), and the surfaces of the microspheres possessed large pore‐like structures. A chromatographic experiment demonstrated that the resulting microspheres exhibited high levels of recognition and selectivity toward the target molecule. The particles were employed as a novel sorbent in a molecularly imprinted SPE protocol. A method was then developed involving the combination of the pretreatment with HPLC to determine the levels of estrogen secreted from Michigan Cancer Foundation‐7 cells. The obtained results revealed that the extraction recoveries of E2 from real samples were in the range of 73.0–97.5% with RSDs of < 7.5% (n = 3). Calibration curves were established with R values > 0.9996 for concentrations in the range of 0.50–100.00 ng/mL. The LOD of this new method was 0.14 ng/mL. Compared with traditional C₁₈ SPE agents, the particles showed high selectivity and extraction efficiency for E2 in the pretreatment process. The particles could therefore be used to determine trace estrogen in biological samples with a UV detector only.