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High‐Performance n‐Channel Thin‐Film Field‐Effect Transistors Based on a Nanowire‐Forming Polymer
Hahm, Suk Gyu,Rho, Yecheol,Jung, Jungwoon,Kim, Se Hyun,Sajoto, Tissa,Kim, Felix S.,Barlow, Stephen,Park, Chan Eon,Jenekhe, Samson A.,Marder, Seth R.,Ree, Moonhor WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.16
<P><B>Abstract</B></P><P>A new electrontransport polymer, poly{[<I>N,N′</I>‐dioctylperylene‐3,4,9,10‐bis(dicarboximide)‐1,7(6)‐diyl]‐<I>alt</I>‐[(2,5‐bis(2‐ethyl‐hexyl)‐1,4‐phenylene)bis(ethyn‐2,1‐diyl]} (PDIC8‐EB), is synthesized. In chloroform, the polymer undergoes self‐assembly, forming a nanowire suspension. The nanowire's optical and electrochemical properties, morphological structure, and field‐effect transistor (FET) characteristics are investigated. Thin films fabricated from a PDIC8‐EB nanowire suspension are composed of ordered nanowires and ordered and amorphous non‐nanowire phases, whereas films prepared from a homogeneous PDIC8‐EB solution consist of only the ordered and amorphous non‐nanowire phases. X‐ray scattering experiments suggest that in both nanowires and ordered phases, the PDIC8 units are laterally stacked in an edge‐on manner with respect to the film plane, with full interdigitation of the octyl chains, and with the polymer backbones preferentially oriented within the film plane. The ordering and orientations are significantly enhanced through thermal annealing at 200 °C under inert conditions. The polymer film with high degree of structural ordering and strong orientation yields a high electron mobility (0.10 ± 0.05 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>), with a high on/off ratio (3.7 × 10<SUP>6</SUP>), a low threshold voltage (8 V), and negligible hysteresis (0.5 V). This study demonstrates that the polymer in the nanowire suspension provides a suitable material for fabricating the active layers of high‐performance n‐channel FET devices via a solution coating process.</P>
Electrocatalytic activity of Cu2O nanocubes based electrode for glucose oxidation
FELIX, S.,KOLLU, P.,RAGHUPATHY, B. P.,KWAN JEONG, S.,NIRMALA GRACE, A. Springer Science + Business Media 2014 Journal of chemical sciences Vol.126 No.1
A direct electrocatalytic activity of glucose oxidation on cuprous oxide modified glassy carbon electrode is reported. Cu2O nanocubes were synthesized by a simple wet chemical route in the absence of surfactants. Purity, shape and morphology of Cu2O are characterized by XRD, SEM, XPS and DRS-UV. The Cu2O nanocubes-modified glassy carbon electrode (GCE) exhibited high electrocatalytic activity towards glucose oxidation compared with bare GCE electrode. At an applied potential of +0.60 V, the Cu2O electrode presented a high sensitivity of 121.7 mu A/mM. A linear response was obtained from 0 to 500 mu M, a response time less than 5 s and a detection limit of 38 mu M (signal/noise=3). The Cu2O nanocubes-modified electrode was stable towards interfering molecules like uric acid (UA), ascorbic acid (AA) and dopamine (DA). In short, a facile chemical preparation process of cuprous oxide nanocubes, and the fabricated modified electrode allow highly sensitive, selective, and fast amperometric sensing of glucose, which is promising for the future development of non-enzymatic glucose sensors.
Felix, S.,Kollu, P.,Raghupathy, B.P.C.,Jeong, S.K.,Grace, A.N. Elsevier Sequoia 2015 Journal of Electroanalytical Chemistry Vol.739 No.-
Platelet-like copper oxide nanostructures were prepared by a hydrothermal method. Various techniques like X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) were used to characterize the structure and morphology of the as-prepared products. The electrocatalytic oxidation of carbohydrates and dopamine on the surface of the modified electrode were studied by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CA). Under the optimal experimental condition, the CuO nanoplatelets (CuO NPlts) loaded on glassy carbon electrode (GCE) exhibited excellent sensitivity in the linear concentration range of carbohydrates, good stability and reproducibility. Interferences from other biological compounds were studied and results indicated good selectivity for glucose, sucrose, and fructose. Apart from the detection of carbohydrates, the electrode was tested for detection possibility of dopamine in the range of 10-80μM in phosphate buffer solution (PBS) with a detection limit of 8.25μM.
Development of a Novel Imaging Agent for Determining Albumin Uptake in Solid Tumors
S. Daum,J. P. Magnusson,L. Pes,J. Garcia Fernandez,S. Chercheja,F. Medda,F. I. Nollmann,S. D. Koester,P. Perez Galan,A. Warnecke,K. Abu Ajaj,Felix Kratz 대한핵의학회 2019 핵의학 분자영상 Vol.53 No.3
Purpose The purpose of this study was to investigate the albumin-binding compound 111In-C4-DTPA as an imaging agent for the detection of endogenous albumin accumulation in tumors. Methods 111In-C4-DTPA was injected in healthy nude mice for pharmacokinetic and biodistribution studies (10 min, 1, 6, 24, and 48 h, n = 4) and subsequently in tumor-bearing mice for single-photon emission computed tomography/X-ray-computed tomography (SPECT/CT) imaging studies. Four different human tumor xenograft models (LXFL529, OVXF899, MAXFTN401, and CXF2081) were implanted subcutaneously unilaterally or bilaterally (n = 4–8). After intravenous administration of 111In-C4-DTPA, SPECT/CT images were collected over 72 h at 4–6 time points. Additionally, gamma counting was performed for the blood, plasma, lungs, heart, liver, spleen, kidneys, muscle, and tumors at 72 h post-injection. Results 111In-C4-DTPA bound rapidly to circulating albumin upon injection, and the radiolabeled albumin conjugate thus formed was stable in murine and human serum. SPECT/CT images demonstrated a time-dependent uptake with a maximum of 2.7– 3.8% ID/cm3 in the tumors at approximately 24 h post-injection and mean tumor/muscle ratios in the range of 3.2–6.2 between 24 and 72 h post-injection. The kidneys and bladder were the predominant elimination organs. Gamma counting at 72 h postinjection showed 1.3–2.5% ID/g in the tumors and mean tumor/muscle ratios in the range of 4.9–9.4. Conclusion 111In-C4-DTPA bound rapidly to circulating albumin upon injection and showed time-dependent uptake in the tumors demonstrating a potential for clinical application as a companion imaging diagnostic for albumin-binding anticancer drugs.
Olise, Felix S.,Ajala, Afis,Olaniyi, Hezekiah B. Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.2
The Feshbache-Kermane-Koonin (FKK) multi-step direct (MSD) theory of pre-equilibrium reactions has been used to compute the single-step cross-sections for some (p,${\alpha}$) reactions using the knock-on and pick-up reaction mechanisms at two incident proton energies. For the knock-on mechanism, the reaction was assumed to have taken place by the direct ejection of a preformed alpha cluster in a shell-model state of the target. But the reaction was assumed to have taken place by the pick-up of a preformed triton cluster (also bound in a shell-model state of the target core) by the incident proton for the pick-up mechanism. The Yukawa forms of potential were used for the proton-alpha (for the knock-on process) and proton-triton (for the pick-up process) interaction and several parameter sets for the proton and alpha-particle optical potentials. The calculated cross-sections for both mechanisms gave satisfactory fits to the experimental data. Furthermore, it has been shown that some combinations of the calculated distorted wave Born approximation cross-sections for the two reaction mechanisms in the FKK MSD theory are able to give better fits to the experimental data, especially in terms of range of agreement. In addition, the theory has been observed to be valid over a wider range of energy.
연승훈(Seunghoon Yeon),Felix M. Villarreal S.J.(Felix M. Villarreal S.J.) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2B
분산 시스템은 독자적인 프로세서들이 네트웍으로 연결되어 있고, 공유하는 메모리와 시스템 시계가 없다. 분산 시스템에서는 어떤 프로세스가 CPU등의 자원을 사용하기 위해서 한 호스트에서 대기하는 동안 다른 호스트는 유휴(idle)상태일 확률이 높다[1]. 그렇기 때문에 분산 시스템의 성능 향상을 위해서는 모든 프로세서들에게 동등한 양의 작업을 할당하는 부하 균형(load balancing)을 하여야 한다. 본 논문에서는 아메바 분산 운영체제상에서 부하균형 작업을 하기 위한 부하 균형 서버를 분산해서 단일 서버 방식일때보다 서버 자체에 부과되는 부하를 줄여서 부하 균형 작업 요청에 대한 반응 시간을 감소시키고, 서버의 오동작이나 고장으로 인한 시스템 전체 성능 저하를 줄이는 방안을 제시한다.