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RISS 인기검색어
- 검색키워드
- 저자 : 이수승 (검색결과 3 건)
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Fabrication of plasmonics platform for the chemical and environmental sensors
In the various field of nanotechnology and nanoscience, such as biomedical and environmental science, the design and synthesis of certain nanostructure for a desired purpose is important. Metallic nanostructures have attracted significant attention in the research area of chemical and environmental sensor due to the superior physic-chemical properties and, especially, applicability to the utilization of surface plasmon resonance phenomena. This thesis mainly deals with the application of novel metallic nanostructures to the surface plasmon resonance phenomena for the realization of effective chemical and environmental sensor. And more detailed strategies and results related with these topics, as follows; Firstly, highly selective detection system for Cu2+ ions by exploiting specific interactions between the Cu-demetallated form (E,Zn-SOD1) of Cu/Zn-superoxide dismutase (SOD1) and Cu2+ ions using surface plasmon resonance spectroscopy (SPRS) was suggested. I demonstrated that Cu2+ ions have a high affinity for vacant metal-binding sites in the E,Zn-SOD1 protein, compared to other divalent metal ions. On the basis of these measurements, it can be concluded that small amounts of Cu2+ ions can be readily detected as the result of the selective binding between the E,Zn-SOD1 protein and Cu2+ ions. It appears that metalloproteins have considerable potential for use as a novel sensing actuator, as evidenced by the selective binding of E,Zn-SOD1 proteins with Cu2+ ion. This approach can be used in conjunction with other fully or partially demetallated metalloproteins, hence it could be potentially useful in the determination of specific metal ions in aqueous media or demetallated proteins in biological fluids. Additionally, the applicability of gold nanoparticles as a ratiometric sensor was suggested. From the theoretical study using discrete dipole approximation method, it is investigated that dimer structure of gold nanoparticles has unique optical properties compared to separated single gold nanoparticle. It can be appeared new plasmon band with longer wavelength due to the electron oscillations along the longitudinal interparticle axis, and this band can be distinguished clearly with the inherent plasmon band. The intensity ratio of inherent and additional plasmon band could be utilized as the value for the ratiometric sensor. Finally, simple method to fabricate highly branched gold nanostructures with abundant petal-shaped tips by direct growth on the substrate was suggested. A lot of experiments and theoretical calculations have shown highly enhancement of the electromagnetic field in complex gold nanostructures due to the abundant ‘hot spots’ in the individual nanostructures. Among them, multi-branched nanostructure has attracted much attention because of their stronger SERS enhancement factor than other gold nanostructures. In this work, I synthesized and characterized the multi-branched gold nanoparticles, which are applicable to the surface-enhanced Raman detection. It was directly grown on the substrate with simple seed-mediated method, and the optical properties as growth procedure was investigated for the better understanding on the growth process. The multi-branched gold nanoparticles show the very high enhancement factor, thus it can be promising materials for the effective SERS substrate.
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루가의 행복선언(6, 20ㄴ)에 나타난 '가난'에 대한 고찰
It is important that we examine what the Scripture says the approaches of matters about today's poverty and poor people. The text in the Bible which deals with the poverty, clearly are deeply concerned with historical, political, and economical backgrounds. Therefore, I am going to study how to understand the poverty in the Old and New Testaments. By doing so, we can rightly understand the conception of the poverty shown in the Bible. Simultaneously, we can reconfirm the meaning of true poverty mentioned on St. Luke's Beatitudes(Lk. 6,20b). These are the goal of my treatise. In the first chapter, I researched the ambiguity about the word,"poverty", to understand the major word, "poverty". In the second chapter, I looked over the poor how to appear historically through the economical and social consideration of Israel at that time. That is, I inquired it at the starting point of Cannaanite settlement, the period of Imperial rule and excilic life. And then I investigated the poor people by means of the Pentateuch, the Prophetic book, the Wisdom literature and the Psalms. In the third chapter, I examined the situation the poor people faced in Jesus' age through the economical and social consideration in His time. And I studied the poverty mentioned in post-judaism, the Gospel and St. Paul's letters. Finally, at the end of the third chapter, I inspected the colligation of Biblical view and theological understanding with relation to the poverty. In the forth chapter, I looked into the poverty given in the Beatitudes. Above all, I studied the position of St. Luke's living and what the poor who St. Luke says mean, and the concrete message about the poor people through the text in the Bible. And, to examine the meaning of poverty in Lk. 6,20b, through a comparative research with Matthew 5,3, parallel phrase with this phrase. I took it concrete shape the meaning of the poor, the first Proclamation of the Beatitudes. And then I concluded as producing the true sense through Biblical exegesis. We Christians who live filled with individualism should escape from the adhesion of material and live in spiritual poverty as well as in material one for the kingdom of God and the poor. In other words, we ourselves share riches of this world which are undertaken from God, the Creator and Supreme Being community of the Early Church practiced. Moreover, we ourselves recognize that we don't have anything to be proud of before God, trust wholly the God and pursue His kingdom first of all. By doing this, the Church is not for the poor, but it will have the first step to live as the church of the poor people.
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