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노종욱 ( Jong Wook Roh ),장소영 ( So Young Jang ),강주훈 ( Joo Hoon Kang ),이승현 ( Seung Hyun Lee ),노진서 ( Jin Seo Noh ),박정희 ( Jeung Hee Park ),이우영 ( Woo Young Lee ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.2
We investigated the thermal conductivity of individual single-crystalline PbTe nanowires grown by chemical vapor transport method. Suspended MEMS was utilized to precisely measure the thermal conductivity of an individual nanowire. The thermal conductivity of a PbTe nanowire with diameter of 292 nm was measured to be 1.8 W/m·K at 300 K, which is about two thirds of that of bulk PbTe. This result indicates that the thermal conduction through a PbTe nanowire is effectively suppressed by the enhanced phonon boundary scattering. As the diameter of a PbTe nanowire decreases, the corresponding thermal conductivity linearly decreases.
Recent Development of Transition Metal Oxide Based Aqueous Supercapacitor Electrode Materials
임종형(Jong Hyeong Lim),조혁래(Hyeokrae Cho),정용재(Yong-jae Jung),노종욱(Jong Wook Roh),신원호(Weon Ho Shin) 한국세라믹학회 2021 세라미스트 Vol.24 No.2
With the development of electric devices such as smart phones or electric vehicles, energy storage systems with high energy/power density and stable operation need to be developed together. The supercapacitors using aqueous electrolyte have great potential for electrochemical energy storage system due to their high power densities and long cyclic performances. The state-of-the-art materials for supercapacitors are carbon based porous materials having high specific surface areas and electrical conductivities. However, they have relatively low energy density that still need to enhance specific capacitance by using the nanostructure of transition metal oxide (TMO) materials. The TMOs store charge through redox reactions like battery systems and their rates are comparable to those of conventional electrochemical double-layer capacitors. In this review, we describe the fundamental principle of TMO based supercapacitors and the recent progress for realizing high performance of TMO based supercapacitors. In addition, we categorize the TMO system as single cation and mixed cations and suggest the prospects for electrochemical energy storage fields.
논문 : 압축응력에 의한 박막 위 나노선 성장법을 이용한 Bi-Te 코어/쉘 열전 나노선 합성
강주훈 ( Joo Hoon Kang ),함진희 ( Jin Hee Ham ),노종욱 ( Jong Wook Roh ),노진서 ( Jin Seo Noh ),이우영 ( Woo Young Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.5
For an enhanced thermoelectric performance, one-dimensional heterostructure nanowires were created that consisted of aBi core and Te shell. The structure was fabricated by depositing Te in-situ onto a Bi nanowire grown by our unique OFF-ON (on-film formation of nanowires) method. After examining a cross-sectional TEM image, it was found that diffusive interface was formed between Bi and Te. Selected area electron diffraction revealed that the crystallinity of the Te shell was some what lower compared to the highly single-crystalline Bi core. The Bi-Te core/shell nanowires can be a smart structure that suppresses phonon transport by several scattering mechanisms, making the OFF-ON method the simplest way to realize that structure.