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Development of Graphene-based Sensors on Paper Substrate for the Measurement of pH Value of Analyte
Chia-Yi Lee,Kin Fong Lei,Shiao-Wen Tsai,Ngan-Ming Tsang 한국바이오칩학회 2016 BioChip Journal Vol.10 No.3
With excellent properties of graphene material, a number of graphene-based devices have been developed with excellent performance in the past decades. However, difficulty of processing graphene material is a hurdle for its practical realization. In this work, we propose to use vacuum filtration process as the major technique to fabricate graphene-based devices. This technique is simple and effective to practically realize graphene-based sensors on paper substrate, which are equipped with the advantages of low cost, simplicity, flexibility, and disposability. In order to show the functionality of the sensor, determination of pH value of analyte was demonstrated by direct measurement of the resistance across the sensor. Results showed that the sensor has the sensitivity of 30.8 Ω/pH and high linearity (R2=0.9282). Since graphene material can be functionalized by various molecules, it is expected that the graphene-based sensor can be further developed to realize more chemical and biological assays with high sensitivity and specificity for remote environment.
Kwon, Jinhyeong,Cho, Hyunmin,Lee, Habeom,Hong, Sukjoon,Suh, Young D.,Moon, Hyunjin,Kim, Dongkwan,Choi, Jun-ho,Lee, Ming-Tsang,Yeo, Junyeob,Ko, Seung Hwan The Electrochemical Society 2015 ECS journal of solid state science and technology Vol.4 No.12
<P>ZnO/Ag hierarchical nanostructure is fabricated by solution-based photoreduction process to demonstrate a photoelectrochimical (PEC) cell charging supercapacitor. The photoreduction process ensures rapid and simple route for employing of Ag nanoparticles onto the surface of ZnO nanorod with well-dispersed and clear crystallization structure. The fabricated ZnO/Ag hierarchical nanostructure showed improved optical and photoelectrochemical properties. Subsequently, the ZnO/Ag hierarchical nanostructure is used as photoanode for PEC cell with enhanced output photocurrent and stability. Furthermore, the PEC cell was connected to lab-made supercapacitors to turn on a light emitting diode. The photoreduction-processed ZnO/Ag hierarchical nanostructures provide a promising and simple production method for energy source in water splitting applications.</P>
Chien-Wei Liao,Ming-Tsang Lee,Yu-Chi Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6
The temperature rise of key internal components and ambient temperature changes during machining processes are the main causes of thermal displacement in machine tool spindle. This wastes materials and reduces working efficiency. A highly accurate and robust thermal spindle displacement estimation scheme is proposed in this paper which is based on the convolutional neural network (CNN) technique. Several key signals of specific dimensions related to spindle thermal displacement were first collected as two-dimensional (2D) signal maps. A multi-level feature expression for these 2D signal maps was extracted using convolution and pooling. A relationship between the extracted features and spindle thermal displacement was then learned using the neural architecture of the full connection layer. Optimized hyperparameter settings were determined by design of experiments (DoE) applied to the proposed CNN model. Experimental results showed that the proposed method had better performance than the multiple regression analysis (MLR) or back propagation neural network (BPNN) methods in terms of estimation accuracy and robustness at different spindle speeds.
Neutron and X-ray scattering on the monolayer structure of a lecithin fullerene-derivative.
Jeng, U-Ser,Lin, Tsang-Lang,Shin, Kwanwoo,Lee, Hsin-Yi,Hsu, Chia-Hung,Chi, Zau-Ann,Shih, Ming Chih,Torikai, Naoya American Scientific Publishers 2007 Journal of Nanoscience and Nanotechnology Vol.7 No.4
<P>Using neutron reflectivity with contrast variation, X-ray reflectivity, and grazing incident small-angle X-ray scattering (GISAXS), we have characterized the in-depth and in-plane structural characteristics of the Langmuir and Langmuir-Blodgett (LB) films formed by a novel lecithin C60-derivative, FPTL, of three phospholipids jointly bonded on one single olefinic moiety of a C60 cage. Based on the neutron reflectivity measured, we have proposed a monolayer structure, with the C60 cages of FPTL lifted into the air and hydrophilic phospholipid heads immersed in water, for the FPTL Langmuir layer formed on water. On the other hand, the LB film of FPTL prepared on mica exhibits clear Kiessig fringes in the X-ray reflectivity profile, indicating a 27 angstroms monolayer film with less molecular orientation. With GISAXS, we have extracted an in-plane correlation length of about 210 A for a possible in-plane aggregation of C60 of FPTL in the LB monolayer. We have also demonstrated the highly ordered monolayer structures of a lecithin lipid, in elucidating the positive effect of the attached functional group-phospholipids on the monolayer formation of the lecithin C60-derivative.</P>
Development of a 2-Chamber Culture System for Impedimetric Monitoring of Cell-cell Interaction
Kin Fong Lei,Meng-Tsan Tsai,Ming-Hong Zhong,Chia-Hao Huang,Ngan-Ming Tsang,Ming-Yih Lee 한국바이오칩학회 2017 BioChip Journal Vol.11 No.2
In cancer research, study of cell-cell interaction is important to understand tumor initiation, progression, metastasis, and therapeutic resistance. Conventionally, transwell system was adopted and cell proliferation was quantified by end-point bio-assays. The operations are labor-intensive and time-consuming while studying of the dynamic cellular responses of cell-cell interaction. Although impedance measurement was suggested to be a promising technique to monitor cellular responses, electrodes cannot be integrated into the transwell for the measurement purpose. In this work, a 2-chamber culture system incorporated with impedance measurement technique was developed to quantitatively study cell-cell interaction. The chamber was composed of 2 sub-chambers separated with a barrier. By this design, two types of cells could be independently cultured and concurrently monitored under common medium supplied. Cell-cell interaction was demonstrated by aberrant cell proliferation induced by the EGF secreted from the transfected cells cultured on another sub-chamber. Real-time and non-invasive monitoring of cell-cell interaction was successfully demonstrated. This work provides a practical solution for monitoring the dynamic cellular responses of cellcell interaction during the culture course. It is a reliable and convenient platform and facilitate more quantitative assessments in cancer research.