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Radiolarians from the Pohang Basin,Southeast Korea and Paleoceanographic Implications

Acta Geologica Sinica(English Edition) 2012年第6期86卷 1426-1433页

作者： Young-Suk BAK jong-deock lee Hyesu YUN Jinyong OH Seong-Joo lee Kyungpook National University Chonbuk National University Chungnam National University

We identified a total of 101 species and two subspecies of radiolarians belonging to 56 genera from 95 samples collected from the Hagjeon and Duho Formations in the Pohang Basin of the southeastern Korean Peninsula. On the basis of the biostratigraphic range of Cyrtocapsella cornuta and Theocorys redondoensis, the depositional period of the upper Hagjeon and lowest Duho Formations was determined to be early to late Middle Miocene. The occurrence of deep-dwelling radiolarians indicates that the paleobathymetry seems to become gradually progressing toward an upper bathyal environment in the middle part of the Hagjeon Formation. However, we prefer to accept another interpretation for the occurrence of deep-sea indicators in the Hagjeon and the lowest part of the Duho Formations, and consider the presence of a region of upwelling cold water that might have simulated a deep-water environment in relatively shallow water. This interpretation is based on the present upwelling of a cold-water mass off the southeast coast of Korea, the occurrence of upwelling microfossils from the Pohang Basin, and the effect of the closing of the Korea Strait approximately 15 Ma. We also considered that the uppermost part of the studied section represents a shallow-water environment.

关键词： radiolarian depositional environment upweHing Pohang Basin

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UV light driven high-performance room temperature surface acoustic wave NH_(3) gas sensor using sulfur-doped g-C_(3)N_(4) quantum dots

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Nano Research 2023年第5期16卷 7682-7695页

作者： Kedhareswara Sairam Pasupuleti Sourabh S.Chougule Devthade Vidyasagar Na-hyun Bak Namgee Jung Young-Heon Kim jong-Hee lee Song-Gang Kim Moon-deock Kim Department of Physics Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Graduate School of Energy Science and Technology(GEST) Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Department of Materials Science and Engineering Kyungpook National University80 Daehak-roBuk-guDaegu 41566Republic of Korea Graduate School of Analytical Science and Technology Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Department of Digital Agricultural Promotion Agricultural Cooperative UniversityGoyang-siGyeonggi-do 10292Republic of Korea Department of Smart Information Technology Joonbu University305 Donghen-roGoyangKyunggi-do 10279Republic of Korea Institute of Quantum Systems(IQS) Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea

Nanomaterials integrated surface acoustic wave(SAW)gas sensing technology has emerged as a promising candidate for realtime toxic gas sensing applications for environmental and human health ***,the development of novel chemical interface based on two-dimensional(2D)sensing materials for SAW sensors for the rapid and sensitive detection of NH_(3)gas at room temperature(RT)still remains ***,we report a highly selective RT NH_(3)gas sensor based on sulfur-doped graphitic carbon nitride quantum dots(S@g-C_(3)N_(4)QD)coated langasite(LGS)SAW sensor with enhanced sensitivity and recovery rate under ultraviolet(UV)***,the sensitivity of the S@g-C_(3)N_(4)QD/LGS SAW sensor to NH_(3)(500 ppb)at RT is dramatically enhanced by~4.5-fold with a low detection limit(~85 ppb),high selectivity,excellent reproducibility,fast response/recovery time(70 s/79 s)under UV activation(365 nm)as compared to dark ***,the proposed sensor exhibited augmented NH_(3)detection capability across the broad range of relative humidity(20%–80%).Such remarkable gas sensing performances of the as-prepared sensor to NH_(3)are attributed to the high surface area,enhanced functional groups,sulfur defects,UV photogenerated charge carriers,facile charge transfer in the S@g-C_(3)N_(4)QD sensing layer,which further helps to improve the gas molecules adsorption that causes the increase in conductivity,resulting in larger frequency *** gas sensing mechanism of S@g-C_(3)N_(4)QD/LGS SAW sensor is ascribed to the enhanced electroacoustic effect,which is supported by the correlation of resistive type and COMSOL Multiphysics simulation *** envisage that the present work paves a promising strategy to develop the next generation 2D g-C_(3)N_(4)based high responsive RT SAW gas sensors.

关键词： two-dimensional graphitic carbon nitride(2D g-C_(3)N_(4)) sulfur doping quantum dots surface acoustic wave(SAW)sensor NH_(3)gas electroacoustic effect

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