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Oriented ZnO nanostructures and their application in photocatalysis
Man, Minh Tan,Kim, Ji-Hee,Jeong, Mun Seok,Do, Anh-Thu Thi,Lee, Hong Seok Elsevier 2017 Journal of luminescence Vol.185 No.-
<P><B>Abstract</B></P> <P>We report a chemical bath deposition approach for the preparation of large arrays of oriented ZnO nanostructures by activated substrate processes, and precipitated ZnO nanorods by passive occupation of the crystal surface. Photoluminescence dynamics showed that various visible emission characteristics associated with defects such as oxygen vacancy, zinc interstitial or their complexes. In addition, the precipitated ZnO nanorods exhibited excellent performance in the adsorption and photocatalytic decomposition of organic dyes, achieving 95% photodegradation of Rhodamine 6B. Moreover, oxygen defects function as trap sites with strong adsorption abilities towards organic dyes and showed high performance in the photocatalytic degradation of the dye molecules.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Interband Transition and Confinement of Charge Carriers in CdS and CdS/CdSe Quantum Dots
Minh Tan Man,Hong Seok Lee 한국진공학회 2015 Applied Science and Convergence Technology Vol.24 No.5
Quantum-confined nanostructures open up additional perspectives in engineering materials with different electronic and optical properties. We have fabricated unique cation-exchanged CdS and CdS/CdSe quantum dots and measured their first four exciton transitions. We demonstrate that the relationship between electronic transitions and charge-carrier distributions is generalized for a broad range of core-shell nanostructures. These nanostructures can be used to further improve the performance in the fields of bio-imaging, light-emitting devices, photovoltaics, and quantum computing.
Feasibility of Laser-Induced Breakdown Spectroscopy (LIBS) for Classification of Sea Salts
Tan, Man Minh,Cui, Sheng,Yoo, Jonghyun,Han, Song-Hee,Ham, Kyung-Sik,Nam, Sang-Ho,Lee, Yonghoon Society for Applied Spectroscopy 2012 Applied spectroscopy Vol.66 No.3
<P>We have investigated the feasibility of laser-induced breakdown spectroscopy (LIBS) as a fast, reliable classification tool for sea salts. For 11 kinds of sea salts, potassium (K), magnesium (Mg), calcium (Ca), and aluminum (Al), concentrations were measured by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and the LIBS spectra were recorded in the narrow wavelength region between 760 and 800 nm where K (I), Mg (I), Ca (II), Al (I), and cyanide (CN) band emissions are observed. The ICP-AES measurements revealed that the K, Mg, Ca, and Al concentrations varied significantly with the provenance of each salt. The relative intensities of the K (I), Mg (I), Ca (II), and Al (I) peaks observed in the LIBS spectra are consistent with the results using ICP-AES. The principal component analysis of the LIBS spectra provided the score plot with quite a high degree of clustering. This indicates that classification of sea salts by chemometric analysis of LIBS spectra is very promising. Classification models were developed by partial least squares discriminant analysis (PLS-DA) and evaluated. In addition, the Al (I) peaks enabled us to discriminate between different production methods of the salts.</P>
Interband Transition and Confinement of Charge Carriers in CdS and CdS/CdSe Quantum Dots
Man, Minh Tan,Lee, Hong Seok The Korean Vacuum Society 2015 Applied Science and Convergence Technology Vol.24 No.5
Quantum-confined nanostructures open up additional perspectives in engineering materials with different electronic and optical properties. We have fabricated unique cation-exchanged CdS and CdS/CdSe quantum dots and measured their first four exciton transitions. We demonstrate that the relationship between electronic transitions and charge-carrier distributions is generalized for a broad range of core-shell nanostructures. These nanostructures can be used to further improve the performance in the fields of bio-imaging, light-emitting devices, photovoltaics, and quantum computing.
Temperature effects on exciton-phonon coupling and Auger recombination in CdTe/ZnTe quantum dots
Minh Tan Man,Lee, Hong Seok Elsevier 2014 Current Applied Physics Vol.14 No.1
We report the results of experimental studies on temperature-dependent thermal escape and Auger recombination coefficients in CdTe/ZnTe quantum dots. We show that at low temperatures, there is a thermally activated transition between two different states separated by a localization energy of about 15.8 meV, while the primary non-radiative process at high temperatures is thermal escape assisted multi-longitudinal optical (LO) phonons absorption with three phonons. The most striking result is a rapid increase in the Auger coefficient and a reduction in the decay time with increasing temperature above 35 K. These results show that the Auger process is assisted by the participation of phonons with an energy threshold of 34.4 meV and an LO phonon energy of around 19 meV. (C) 2013 Elsevier B.V. All rights reserved.
Thi Le Anh,Tan Man Minh,Tung Do Hoang,Tam Do Quang,Hoa Nguyen Minh 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.9
A first-principles calculation has investigated the structural, electronic, optical of the CdSe nanocrystal (NC) based on the generalized gradient approximation (GGA) method within the density functional theory. The geometric optimization of the unit cell is in good agreement with our experimental data. The band structure, density of states of the NC were analyzed. The results found that CdSe NC is a direct bandgap with an estimated 1.48 eV. We also report the results of dielectric functions and the refractive index (n) characterized. It is indicated that CdSe materials have excellent photoelectric properties potential applications in optoelectronic devices.
Lim, Kee Hong,Man, Minh Tan,Le, Anh Thi,Choi, Jin Chul,Lee, Hong Seok Elsevier 2020 THIN SOLID FILMS - Vol.699 No.-
<P><B>Abstract</B></P> <P>We investigate the influence of the ZnTe separation layer thickness on the photoluminescence (PL) dynamics of CdTe/ZnTe double quantum dots (DQDs) on Si substrates. The results clarify that the DQD's structure effectively improves the limit of the carrier collection and the thermal stability of the corresponding single-layer QDs. The unusual temperature-dependent PL is explained using the single model for thermal redistribution of carrier states. This model indicates that the main nonradiative process at high temperatures is caused by scattering via multiphonons with longitudinal optical phonon energy of about 19–21.3 meV. The confinement-induced mixing and electron-carrier coupling effects cause blue-shift and enhanced PL intensity. We propose that the separation layer controls carrier dynamics in optoelectronic devices by modulating the thermal escape and e-h pairs in the intermixing layers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Influence of ZnTe separation layer thickness in double quantum dots were investigated. </LI> <LI> Photoluminescence dynamic probed the electric field screening effects. </LI> <LI> Separation layer thickness plays a key role in the intermixing and thermal escape effects. </LI> <LI> Carrier dynamics of double quantum dots are evaluated by different models. </LI> <LI> Thermal escape is assisted by multiple phonons with energy of 19.1–21.3 meV. </LI> </UL> </P>