small 2008, 4, 1968–1971
Structural characterization of FePt–graphite shell nanocrystals: a) TEM image. b) Selected-area electron diffraction (SAED) pattern. c) High-resolution TEM image of nanocrystals with an average size of 2.8 nm. d) TEM image of nanocrystals with an average size of 1.9 nm. e) X-ray diffraction patterns of FePt nanocrystals with average sizes of 2.8 and 1.9 nm.
Schematic showing the fabrication of the fct-FePt NPs/C catalysts.
Cyclic voltammograms of non-treated, HOAc-treated, HCl-treated, and HF-treated fct-FePt NP/C and commercial Pt/C catalysts recorded in (a) 0.1 M HClO4 solution and (b, c) 0.1 M HClO4 solution containing 1.0 M methanol. (d) Specific and mass activities of the catalysts. (e) Plot of the specific activities versus thickness (number of atomic layers) of the Pt shell on fct-FePt NPs. (f) Chronoamperometric curves obtained in a 0.1 M HClO4 solution containing 1.0 M methanol at 0.95 V for 30 min.
Nano Research
Nano res. 2017, 10, 8, 2866–2880
DOI 10.1007/s12274-017-1495-5
FeCo/Graphitic Carbon Shell
FeCo
-High saturation magnetization
-Super paramagnetism
Graphitic shell
-Protective layer : non toxicity, oxidation resistance
Application
-Diagnosis by magnetic resonance imaging (MRI)
-Photothermal therapy by near-IR manipulation
-Drug delivery
(a),(b),(c) TEM image of FeCo embeded silica. (d) SAED patterns of f–FeCo/GC nanocrystals. (e) X-ray diffraction (XRD) pattern of f–FeCo/GC. 1 week later(red line), 1 month later(green line). Average size approximately 5.5 nm.
CHEMNANOMAT
ChemNanoMat 2018, 4, 132 –139
DOI: 10.1002/cnma.201700223
J. Am. Chem. Soc. 2005, 127, 6188.
NPG Asia Mater. 2017, 9, e364.
The discovery of unprecedented, non-native phases of transition metal oxides is a fascinating theme in materials chemistry, including the development of new synthetic strategies with excellent size- and phase-selectivity, and elucidation of their unique physicochemical properties. Most of the first-row transition metal monoxides, such as MnO, FeO, CoO and NiO, are known to exist in a cubic phase, but only ZnO adopts a hexagonal structure. This review summarizes recent results on the syntheses and characterization of the non-native phases of h-CoO, h-MnO and c-ZnO transition metal monoxides, compared to their native phases. The investigation of the size- and phase-selective synthetic methods, formation mechanism and unique physicochemical properties of non-native transition metal monoxides would have an enormous impact on materials chemistry and open a promising avenue for magnetic, electronic and spintronic applications.
phase selective synthesis of cubic rocksalt, hexagonal wurtzite structure according to zinc acetate addition
(a), (b) TEM image, (c) HRTEM image, (d) selected area electron diffraction (SAED) patterns and (e) powder X-ray diffraction pattern [ref. JCPDS no. 08-0075 wurtzite ZnO] of h-Zn0.1Co0.9O nanoparticles. The nanoparticles were prepared at 140 ℃, 5 h
Nanoparticles average size measured for (101) reflection of XRD data by using Debye-Scherrer eq. was 20 nm.
국가
대한민국
소속기관
서강대학교 (학교)
연락처
02-705-8448 https://sites.google.com/view/nanochemistrylab/
책임자
서원석 wsseo@sogang.ac.kr