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노종민,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Single-crystalline, octahedral CeO2:Eu3+ nanocrystals is prepared using a simple hydrothermal method. The size of the CeO2:Eu3+ nanocrystals (300-400 nm), as well as their mirror-like facets, significantly improved the diffuse reflectance of visible light. Excitation of the CeO2:Eu3+ nanocrystal with 330 nm ultraviolet light was re-emitted via downconversion photoluminescence (PL) from 570 to 672 nm. Downconversion PL was dominant at 590 nm and had a maximum intensity for 1 mol % Eu3+. The CeO2:Eu3+ nanocrystal-based DSSCs exhibited a power conversion efficiency of 8.36%, an increase of 14%, compared with conventional DSSCs, because of the strong light-scattering and downconversion PL of the CeO2:Eu3+ nanocrystals.
기체분리를 위한 향상된 표면적을 갖는 실리카/GO 혼성막
노종민,신재은,박호범 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.11
Graphene oxide (GO), consisting of numerous oxygen functional groups and 2-D graphene sheet, has drawn intensive attention as a promising membrane material due to its molecular-sieving nanochannel and ease of scale up. However, GO membranes have generally showed a low gas permeability stemming from the high tortuosity of laminate structure. Herein, we prepared silica/GO hybrid membranes to overcome the low gas permeability of GO membrane by tuning its surface area and interlayer spacing. The size of silica nanoparticles grown on the GO nanosheets was successfully controlled by varying the concentration of silica precursor. In particular, the relationship between gas permeability of silica/GO hybrid membranes and the size of silica nanoparticles was investigated.
노종민,이인규,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
In this study, a complex-mediated synthetic growth method was used to fabricate Ag nanoparticles embedded poly(vinyl alcohol) (PVA) nanofibers in an aqueous solution. Azobisisobutyronitrile (AIBN) played a crucial role in the preparation of the Ag-PVA nanofibers, through its cyano groups. AIBN was used to assemble the Ag ions to form Ag complexes in the early stages of the reaction. As the reaction temperature got close to 60 oC, the C-N bonds of AIBN decomposed, and thus the Ag compounds became disassembled. During this stage, Ag nanoparticles were aligned with a PVA assistant, which acted as a gelator and stabilizer for the formation of fibrous nanostructures under magnetic stirring conditions. As a result, PVA nanofibers with a diameter of ca. 35 nm were synthesized, embedded Ag nanoparticles (diameter: ca. 8 nm) compactly in the inner part of the fiber. The formation of Ag-PVA composite nanofibers was systematically investigated with field-emission scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Additionally, we performed several control experiments and proposed a probable mechanism for the synthesis of Ag-PVA composite nanofibers.
An aqueous one-pot synthesis of Ag@AgBr nanoparticles and their plasmonic photocatalytic perfomance
노종민,이인규,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Ag@AgBr nanoparticles were synthesized via an aqueous, one-pot route. In this study, poly(vinyl alcohol) (PVA) acted as a stabilizer for the formation of nano-sized AgBr composites through interaction with Ag ions and their hydroxyl groups. The mild reducing agent L-arginine was used for partial reduction of AgBr to form metallic Ag nanoparticles on the AgBr surface. The metallic Ag nanoparticles improved light absorption in the visible region due to surface plasmon resonance (SPR). The size of the synthesized nanoparticles was controlled by controlling the reaction temperature, and had an effect on the light absorption of Ag@AgBr nanocomposites. The prepared Ag@AgBr nanoparticles exhibited excellent photocatalytic activities under both visible light and direct sunlight.