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용액 공정으로 증착된 HfOx 감지막을 갖는 Electrolyte-Insulator-Semiconductor 소자의 두께 의존성
이인규 ( In Kyu Lee ),조원주 ( Won Ju Cho ) 한국센서학회 2013 센서학회지 Vol.22 No.3
We fabricated electrolyte-insulator-semiconductor (EIS) devices using a solution process and measured the sensing properties of EIS devices according to the thicknesses of sensing membrane. For high pH sensitivity and better stability properties, we used SiO2/HfOx (OH) layer as a sensing membrane. In this work, HfOx sensing membranes were deposited on 5 nm thick SiO2 buffer layer by spin coater with thicknesses of 15, 31, 42, 55 nm, respectively. As a result, we founded that the thickness of HfOx sensing membrane affects to sensitivity and chemical stability of EIS device. Especially, the EIS device with 42 nm thick HfOx membrane showed superior sensing ability in terms of pH-sensitivity, linearity, hysteresis voltage and drift rate characteristics than the other devices. In conclusion, we confirmed that it is possible to improve the sensing ability and the chemical stability properties using optimized thickness of sensing membrane and proper annealing process.
양수민,( Hong Dinh Duong ),이종일 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Two pH-sensitive fluorescent dyes such as 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS) and fluoresceinamine (FA) are doped into tetraethyl orthosilicate (TEOS) or melamine formaldehyde (MF) sphere particles and then incorporated with several kinds of supporting polymers for fabrication of the pH-sensing membranes. The response of the pH-sensing membranes seems to be depended on properties of the conjugated polymers since the conjugated polymers can interact or prevent charged species upon protonation or deprotonation of the pH-sensing membranes and lead to the changes in the linear pH measurement range. This study shows the extending of pH measurement ranges of the pH-sensing membranes by demands of specific applications.
High-k 감지막 평가를 통한 고성능 고감도의 Electrolyte-Insulator-Semiconductor pH센서 제작
배태언,장현준,조원주,Bae, Tae-Eon,Jang, Hyun-June,Cho, Won-Ju 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.2
We fabricated the electrolyte-insulator-semiconductor (EIS) devices with various high-k sensing membranes to realize a high quality pH sensor. The sensing properties of each high-k dielectric material were compared with those of conventional $SiO_2$ (O) and $SiO_2/Si_3N_4$ (ON) membranes. As a result, the high-k sensing membranes demonstrated better sensitivity and stability than the O and ON membranes. Especially, the $SiO_2/HfO_2$ (OH) stacked layer showed a high sensitivity and the $SiO_2/Al_2O_3$ (OA) stacked layer exhibited an excellent chemical stability. In conclusion, the high-k sensing membranes are expected to have excellent operating characteristics in terms of sensitivity and chemical stability for the biosensor application.
용존산소와 pH의 동시 검출용 광학 센서 막을 이용한 미생물 발효공정의 온라인 모니터링
김춘광(Chun-Kwang Kim),이종일(Jong Il Rhee) 한국생물공학회 2009 KSBB Journal Vol.24 No.1
An optical sensing membrane has been fabricated to measure the concentration of dissolved oxygen(DO) and pH value simultaneously. It has employed HPTS as a pH sensitive dye and a ruthenium(Ⅱ) complex as a DO sensitive dye. The sensing membrane has been applied to wells in a 24-well microtiter plate. Using the 24-well microtiter plate the concentrations of dissolved oxygen and pH values have been on-line monitored during the cultivations of E.coli DH5α , B.cereus 318 and P.pastoris X-33. On-line monitoring of DO and pH in microorganism cultivation processes showed good performance of the sensing membrane containing 5 mM HPTS and 2 or 5 mg/mL Rudpp.
마이크로플레이트 기반 생물반응기 시스템 (MABOOMS™)을 이용한 대장균 배양공정에서 용존산소, pH 및 세포농도의 온라인 모니터링 연구
손옥재(Ok-Jae Sohn),이종일(Jong Il Rhee) 한국생물공학회 2013 KSBB Journal Vol.28 No.1
Dissolved oxygen, pH and cell concentration have been online monitored in cultivation processes with Escherichia coli by using a MABOOMS™ (microplate-based bioreactor with optical online monitoring systems). Fluorescent sensing membranes containing Ru (dpp)₃<SUP> 2+</SUP> or HPTS were prepared with GA sol-gel matrix and coated into a well of a 24-well microplate. Fluorescence intensity was measured and correlated to the dissolved oxygen or pH. Cell concentrations were also online monitored by measuring optical reflectance at 650 nm. A well of a 24-well microplate could also be divided into 4 parts, each of which was coated with fluorescent sensing membranes for the detection of dissolved oxygen or pH. The 24-well microplate coated with fluorescent sensing membranes or a 4-divided sensing membrane. was used to online monitor the dissolved oxygen, pH and cell concentration during E. coli cultivations. The online monitoring results showed the characteristics of cell growth in cultivation processes very well.
라모가 읽은 이성적 사랑과 감성적 사랑: 음악비극 ≪이폴리트와 아리시≫의 아리시와 페드르를 중심으로
유선옥 한양대학교 음악연구소 2020 音樂論壇 Vol.44 No.-
As in Sense and Sensibility(1811), the most famous novel written by Jane Austen(1775-1817), two contrasting female characters are depicted in Rameau’s first tragédie en musique, Hippolyte et Aricie(1733, Paris). The two female characters, Aricie and Phèdre, are both i n love with Hippolyte. However, the way the two show their love towards Hippolyte is completely different. Aricie shows a rational approach to love, carefully contemplating her emotion towards Hippolyte and following the order and law of the Gods. Phèdre, on the other hand, is extremely emotional and unable to control her inappropriate love towards her stepson. The way Rameau regarded the two different attitudes towards love is reflected in the key signatures and the tonalities used in Hippolyte et Aricie. In his first treatise Traité de l’harmonie réduite à ses principes naturels(1722), Rameau defines the difference between a major tonality and a minor tonality, and the different characters of each tonalities. In Observations sur notre instinct pour la musique(1754), he attempts to define the characters of each key signature based on scientific evidence. According to Rameau’s theory established in these treatises, major tonalities and natural(♮) and sharp(♯) key sign atures a re n atural, whereas minor tonalities and flat(♭) key signatures are unnatural. Thus Rameau considered the major tonalities and natural and sharp key signatures to be stronger and more positive than the artificially generated minor tonalities and flat key signatures. In Hippolyte et Aricie, the music of Aricie is written in a major key(D Major) with a sharp key signature and the music of Phèdre in a minor key(d, g m in or) with a flat key signature. It is clear that Rameau deliberately distinguished the two characters by composing their music in different keys, and the key sign atures u sed in their music indicate that the composer regarded sensible love as positive and sensitive love as negative. 1733년 파리에서 초연된 라모의 첫 번째 음악비극 ≪이폴리트와 아리시≫에는 제인 오스틴의 첫 번째 장편 소설 『이성과 감성』에서처럼 두 명의 대비되는 여성 인물인 아리시와 페드르가 등장한다. 두 사람은 동일하게 이폴리트를 사랑한다. 그러나 그들이 보여주는 사랑 방식은 전혀 다르다. 먼저 아리시는 이폴리트를 향한 사랑의 감정을 사려 깊게 숙고하며 신의 질서와 법에 따라 통제하는 ‘이성적 사랑’을 보여준다. 한편 페드르는 의붓아들인 이폴리트를 향한 부정한 사랑을 결코 제어하지 못하는 ‘감성적 사랑’을 보여준다. 그리고 이러한 그들의 서로 다른 사랑의 방식은 라모에 의해 조표와 조성으로 반영되어 나타난다. 저명한 이론가이기도 했던 라모는 1722년에 발간한 첫 번째 이론서 『화성론』에서 장⋅단조와 각 조성의 성격을 특징지었고, 1754년에 출간한 『음악에 대한 본능과 그것의 원리에 대한 관찰』에서 조표의 특성을 과학적으로 설명하고자 했다. 그에 의하면 장조와 ♮과 ♯의 조표는 자연적으로 생성되는 반면, 단조와 ♭의 조표는 인위적으로 만들어진다. 이에 따라, 라모는 자연적인 장조와 ♮과 ♯의 조표가 그렇지 않은 단조와 ♭의 조표보다 더 강하고 긍정적인 특징을 지닌다고 여겼다. 따라서 라모는 ‘이성적 사랑’의 아리시를 ♯조표의 D장조를 중심 조성으로 작곡함으로써, ♭조표의 d단조와 g단조로 작곡된 ‘감성적 사랑’의 페드르보다 더 긍정했음을 고찰하여 볼 수 있다.
Yoo, Kwangho,Kim, Suji,Han, Narae,Kim, Ga Eun,Shin, Min Jae,Shin, Jae Sup,Kim, Min Applied Science Publishers 2018 Dyes and pigments Vol.149 No.-
<P><B>Abstract</B></P> <P>A reversible red-yellow color change in PDA (polydiacetylene) was achieved by controlling the head group of the diacetylene molecules. Typical PDAs show blue-red color transitions, and this reversible red-yellow color transition could be applied to various sensing applications. The introduction of an alkyl substituent to the head group as an internal stimulus resulted in a primary blue-red color change, and this change became clearer as the length of the alkyl chain became longer. The PDA vesicle, once colored red in response to an internal stimulus, showed a reversible and very selective red-yellow color change in response to a second external stimulus, such as temperature or pH.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A reversible red-yellow color transition of PDAs was achieved by alkyl chain induced PCDA-Oct. </LI> <LI> Stepwise blue-red-yellow color changes are suggested through internal and external stimuli. </LI> <LI> Both temperature and pH sensing were successfully performed using modified PCDA-Oct. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>