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- 검색키워드
- 저자 : ( Ganesh Ghimire ) (검색결과 5 건)
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Ghimire, Ganesh,Adhikari, Subash,Jo, Seong Gi,Kim, Hyun,Jiang, Jinbao,Joo, Jinsoo,Kim, Jeongyong American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.12
<P>Monolayer transition-metal dichalcogenides (1L-TMDs) provide ideal platforms to study light emission using two-dimensionally confined excitons. Recent studies have shown that the exciton emissions of 1L-TMDs can be conveniently modulated by developing heterostructures with zero-dimensional nanoparticles (NPs) or quantum dots. In this study, we synthesized organic semiconducting copper phthalocyanine (CuPc) NPs with sizes in the range of 30-70 nm by a re-precipitation method and decorated the chemical vapor deposition-grown 1L-MoS<SUB>2</SUB> with these NPs. This hybrid system exhibited a 6 times larger local photoluminescence (PL) at the positions of the CuPc NPs compared with the pristine 1L-MoS<SUB>2</SUB> sample. The PL enhancement and spectral modification of the 1L-MoS<SUB>2</SUB> decorated with CuPc NPs were attributed to the p-doping effect of the CuPc NPs, confirmed by spectral analysis and field-effect transistor measurements.</P> [FIG OMISSION]</BR>
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Ghimire, Ganesh,Dhakal, Krishna P,Neupane, Guru P,Gi Jo, Seong,Kim, Hyun,Seo, Changwon,Hee Lee, Young,Joo, Jinsoo,Kim, Jeongyong IOP 2017 Nanotechnology Vol.28 No.18
<P>Organic/inorganic hybrid structures have been widely studied because of their enhanced physical and chemical properties. Monolayers of transition metal dichalcogenides (1L-TMDs) and organic nanoparticles can provide a hybridization configuration between zero- and two-dimensional systems with the advantages of convenient preparation and strong interface interaction. Here, we present such a hybrid system made by dispersing <I>π</I>-conjugated organic (tris (8-hydroxyquinoline) aluminum(III)) (Alq<SUB>3</SUB>) nanoparticles (NPs) on 1L-MoS<SUB>2</SUB>. Hybrids of Alq<SUB>3</SUB> NP/1L-MoS<SUB>2</SUB> exhibited a two-fold increase in the photoluminescence of Alq<SUB>3</SUB> NPs on 1L-MoS<SUB>2</SUB> and the n-doping effect of 1L-MoS<SUB>2</SUB>, and these spectral and electronic modifications were attributed to the charge transfer between Alq<SUB>3</SUB> NPs and 1L-MoS<SUB>2</SUB>. Our results suggested that a hybrid of organic NPs/1L-TMD can offer a convenient platform to study the interface interactions between organic and inorganic nano objects and to engineer optoelectronic devices with enhanced performance.</P>
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( Ganesh Ghimire ),( Yongjun Lee ),( Seokjoon Yun ),서창원,( Hyun Kim ),( Roy Aad ),( Young Hee Lee ),김정용 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Monolayer transition metal dichalcogenide (1L-TMDs) provides a convenient platform to design light emission from 2 dimensionally confined excitonic systems. Many body effects arising from strong interactions among carriers have been of considerable interest in nanoscience. The exciton-exciton annihilation (EEA) process reduces the generated excitons density and affects the performances of the opto-electronic devices. We studied multiexciton dynamics in chemically treated TMDs like MoS<sub>2</sub>, WS<sub>2</sub> and WSe<sub>2</sub> using non-linear photoluminescence (PL) spectroscopy. We also studied the many body correlations between excitons in pristine and chemically treated 1L-TMDs by excitation power dependence of PL and time resolved PL spectroscopy. We observed the decrease of the EEA rate after the chemical treatment.
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Viral Hepatitis among the Emigrants Population of Nepal
( Sangita Ghimire ),( Mithileshwer Raut ),( Ganesh Adhikari ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Viral hepatitis is inflammation of the liver due to a viral infection. It may present in acute or chronic forms.Viruses that primarily attacks the liver is called hepatitis viruses. There are several types of hepatitis viruses including types A, B, C, D, E, and possibly G. Types A, B, and C are the most common.Viral hepatitis is the significant health problem in Nepal. The emi grants going abroad for job are found infected with viral hepa titis during domestic medical examination. Some people return to domestic country after they are diagnosed with the disease in foreign country which creates the great financial as well as social problem.The aim of this study is to find out the seroprevalance of viral Hepatitis B and Hepatitis C in nepalese emigrants. Methods: The descriptive cross-sectional study was conducted in the domestic medical eamination centre within a period of six months from Jan -July 2017. The study included 800 people who visited the center for medical check up. Serum samples from these people were screened for HBV and HCV by ELISA method and reactive samples were counter checked by immu nochromatographic method. Results: Of the 800 emigrants screened, 0.6 % was infected with Hepatitis B whereas 0.3% was infected with hepatitis C. Among the infected cases, 0.77% of the (15-25) age group was infected with hepatitis B. Also, 0.65% and 0.3% of (26-35) age group were infected with HBV and HCV respectively. Similarly, 1.0% of (36-45) age group was only infected with Hepatitis C. Also, 0.9% and 0.3% of the emigrants were infected with syph ilis and HIV respectively during the serological screening. Conclusions: Viral hepatitis is in increasing trend among immi grants’ people and indicates the need for Nepalese healthcare authorities to enhance their support for providing screening, HBV vaccination, treatment, and educational programs for this populations.
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Dhakal, Krishna P.,Roy, Shrawan,Yun, Seok Joon,Ghimire, Ganesh,Seo, Changwon,Kim, Jeongyong The Royal Society of Chemistry 2017 Journal of materials chemistry. C, Materials for o Vol.5 No.27
<▼1><P>Spatially heterogeneous effects of bis(trifluoromethane)sulfonimide (TFSI) and benzyl viologen (BV) treatment on the optical properties of triangular monolayer tungsten disulfides are investigated by nanoscale spectral imaging.</P></▼1><▼2><P>Chemical treatments were recently shown to be very effective in enhancing the exciton emission of monolayer transition metal dichalcogenides (1L-TMDs) by suppressing the exciton quenching caused by structural defects. However, the effects of these chemical treatments varied greatly depending on the synthesis method and the type of 1L-TMD; therefore, the exact origin of the emission enhancement is still elusive. Here we report the spatially heterogeneous effects of bis(trifluoromethane)sulfonimide (TFSI) and benzyl viologen (BV) treatment on the optical properties of triangular 1L-WS2 grown by chemical vapor deposition (CVD). Nanoscale photoluminescence (PL) and Raman spectral maps showed that TFSI had a minimal effect on the inner region of the triangular WS2 grain, whereas the PL of the edge region was enhanced up to 25 times; further, BV reduced the PL, also more strikingly in the edge region. Systematic variation of the spectral weights among neutral excitons, trions, and bi-excitons indicated that p-doping and n-doping with TFSI and BV, respectively, occurred in both the inner and edge regions; however, the PL enhancement was attributed mainly to the reduction of structural defects caused by TFSI treatment. Our observation of the spatially heterogeneous effects of chemical treatment suggests that the inner and edge regions of CVD-grown 1L-WS2 are populated with different types of structural defects and helps in clarifying the mechanism by which chemical treatment enhances the optical properties of 1L-TMDs.</P></▼2>
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