New Physics: Sae Mulli

Aims and Scope

The origin of New Physics: Sae Mulli (NPSM, ISO abbreviation: New Phys.: Sae Mulli.): Sae Mulli (새물리 in Korean characters means ‘new physics’) is the oldest Korean pure scientific journal. It was first published in 1961 just after the Korean War by the Korean Physical Society (KPS). The primary mission of Sae Mulli was to start building up Korean physics research community from almost nothing and in fact Sae Mulli had made tremendous contributions to the Korean science community. Through a peer-review system, Sae Mulli had continued elevating the level of scientific researches, consequently becoming a cornerstone of the economic miracle of Korea...

Editor-in-Chief : Sunglae CHO
New Physics: Sae Mulli Editorial Board

pISSN : 0374-4914
eISSN : 2289-0041

Tel : +82-2-556-4737
Fax : +82-2-554-1643
E-mail: npsm@npsm-kps.org

Research Papers

Growth of ZnO Nanostructure Arrays by Using the Hydrothermal Method

Hong Yeol PARK¹, Heesang AHN², Kyujung KIM³, Yoon-Hwae HWANG*⁴

¹ Department of Nanofusion Technology and BK 21 PLUS Nanoconvergence Technology Division, Pusan National University, Miryang 50463, Korea

² Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, Korea

³ Department of Optics and Mechatronics Engineering, Pusan National University, Busan 46241, Korea

⁴ Department of Nanoenergy Engineering, Pusan National University, Busan 46241, Korea

We studied the hydrothermal growth condition of ZnO nanostructure arrays on p-GaN substrates that could be used as light-emitting diode (LED) pixel arrays for bioimage sensors. The ZnO nanostructures were grown in the forms of either nanorods or nanoflowers at different substrate temperatures during the ZnO seed-layer deposition. We found that flower-shaped ZnO nanostructures and ZnO nanorods were grown when a rough seed layer and a smooth seed-layer were formed at temperatures lower and higher than 500 $^\circ$C, respectively. With low seed-layer growth temperatures, a rough surface was formed, provided numerous nucleation sites in patterned holes, and produced dense flower-shaped nanostructures. On the other hands, with high seed-layer growth temperatures, a smooth seed-layer surface was formed and provided nucleation sites for ZnO nanorod growth.

New Phys.: Sae Mulli 2019; 69: 41-45

Study of the Shapes of CdSe/CdS Nanocrystals by Using Raman Spectroscopy and the Stokes Shift

Seong-Wook PARK, Hoon-Hyun CHO, Dong-Sun YOO, Il-Gon KIM*

Department of Physics, Changwon National University, Changwon 51140, Korea

In order to obtain data on the formation process of CdSe/CdS core/shell semiconductor nanocrystals, we subjected samples of nanocrystals to long-term heat treatment at a temperature of 80 $^\circ$C. After a certain time, the absorption and the emission spectra were measured using parts of the samples. As the heat treatment time was increased, the Stokes shift decreased until the growth of the CdSe nanocrystals stopped. The time when the Stokes shift increases after a certain time can be regarded as the time when the surfaces of nanocrystals change. A method for distinguishing whether CdSe/CdS has core-shell structure or is an alloy was studied by analyzing the Raman spectra and the X-ray diffraction (XRD) patterns of the samples at the time when the surfaces of the nanocrystals changed. When CdSe/CdS core-shell semiconductor nanocrystals are synthesized, a chance exists that interfaces will be observed in CdS$_x$Se$_{1-x}$ alloys. Thus, distinguishing whether the synthesized nanocrystals have a core-shell structure or are CdS$_x$Se$_{1-x}$ alloys is possible. If a new phonon is observed between phonon L01 and phonon L02 in the Raman spectra, the material is an alloy. A more precise core-shell structure can be identified by looking at the XRD pattern and the Stokes shift.

New Phys.: Sae Mulli 2019; 69: 16-24

New Phys.: Sae Mulli 2019; 69: 1~118

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Review Paper

A Study on the Measurement and Analysis of the Impedance of Various Materials

Jong-Ho PARK*

New Phys.: Sae Mulli 2019; 69: 1-15 https://doi.org/10.3938/NPSM.69.1