@article{jeon_samal_govindaraju_das_yun_2020, title={Cytotoxicity and Bioimaging Study for NHDF and HeLa Cell Lines by Using Graphene Quantum Pins}, volume={10}, ISSN={["2079-4991"]}, DOI={10.3390/nano10122550}, abstractNote={Herein, we report the synthesis of an interesting graphene quantum material called “graphene quantum pins (GQPs)”. Morphological analysis revealed the interesting pin shape (width: ~10 nm, length: 50–100 nm) and spectral analysis elucidated the surface functional groups, structural features, energy levels, and photoluminescence properties (blue emission under 365 nm). The difference between the GQPs and graphene quantum dos (GQDs) isolated from the same reaction mixture as regards to their morphological, structural, and photoluminescence properties are also discussed along with the suggestion of a growth mechanism. Cytotoxicity and cellular responses including changes in biophysical and biomechanical properties were evaluated for possible biomedical applications of GQPs. The studies demonstrated the biocompatibility of GQPs even at a high concentration of 512 μg/mL. Our results suggest GQPs can be used as a potential bio-imaging agent with desired photoluminescence property and low cytotoxicity.}, number={12}, journal={NANOMATERIALS}, author={Jeon, Seong-Beom and Samal, Monica and Govindaraju, Saravanan and Das, Rupasree Ragini and Yun, Kyusik}, year={2020}, month={Dec} }
 @article{fu_peng_samal_barange_chen_shin_mehta_rozelle_chang_so_2020, title={Mode Dispersion in Photonic Crystal Organic Light-Emitting Diodes}, volume={2}, ISSN={["2637-6113"]}, DOI={10.1021/acsaelm.0c00326}, abstractNote={Similar to an electronic lattice determining the motion of electrons in solids, photonic crystals (PhCs) are periodic photonic nanostructures which determine the propagation of photons. By incorpor...}, number={6}, journal={ACS APPLIED ELECTRONIC MATERIALS}, author={Fu, Xiangyu and Peng, Cheng and Samal, Monica and Barange, Nilesh and Chen, Yi-An and Shin, Dong-Hun and Mehta, Yash and Rozelle, Adam and Chang, Chih-Hao and So, Franky}, year={2020}, month={Jun}, pages={1759–1767} }
 @article{kumar_das_samal_yun_2018, title={Highly stable functionalized cuprous oxide nanoparticles for photocatalytic degradation of methylene blue}, volume={218}, ISSN={["1879-3312"]}, DOI={10.1016/j.matchemphys.2018.07.048}, abstractNote={We report the synthesis and characterization of Cu2O nanoparticles (NPs) in the presence of the coordinating ligands like l-glutamic acid (Glu-Cu2O) and d-glucosamine (GlcN-Cu2O). Even if –NH2 group is common to both the ligands, l-glutamic acid is a straight chain compound containing additional two –COOH groups, whereas, glucosamine is a cyclic compound with additional four –OH groups and an ether (-O-) linkage. Thus the coordinating ligands are different in the nature of the functional groups as well as their molecular skeletons leading to cubic morphology (∼350 nm of average edge length) for l-glutamic acid coordinated Cu2O and spherical morphology (∼250 nm of average diameter) for glucosamine one as observed by Field Effective Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) images. The observed band gap of Cu2O of 1.89 eV is decreased to 1.84 ev for both the ligated structures. Both the ligated cuprous oxide (Cu2O) nanoparticles (NPs) were used for the photocatalytic degradation of methylene Blue (MB). The spherical GlcN-Cu2O showed 98% degradation of MB in 105 min and after 3 cycles of operation, the photocatalytic activity was enough for the 93% degradation of the dye, whereas, the cubic Gu-Cu2O could degrade MB up to 97% in 135 min and after three cycles, only 86% of the dye was degraded. This indicates, the molecular skeleton and functional groups on the ligand control the shape and size of the Cu2O nanoparticles as well as the photocatalytic efficiency and stability. It is presumed, the cyclic glucosamine ligand can protect the Cu2O nanoparticles from erosion during the degradation process.}, journal={MATERIALS CHEMISTRY AND PHYSICS}, author={Kumar, Mohit and Das, Rupasree Ragini and Samal, Monica and Yun, Kyusik}, year={2018}, month={Oct}, pages={272–278} }
 @article{zhong_liu_samal_yun_2018, title={Synthesis of ZnO nanoparticles-decorated spindle-shaped graphene oxide for application in synergistic antibacterial activity}, volume={183}, ISSN={["1011-1344"]}, DOI={10.1016/j.jphotobiol.2018.04.048}, abstractNote={A novel spindle-shaped graphene oxide (GO) was performed by the self-assembly of graphene oxide in the DMF. Loading uniform ZnO nanoparticles on spindle-shaped GO is used to study antibacterial property. In the ZnO/GO composites, spindle-shaped GO possessed special structure that was crumpled together with a length of ~1.0 μm and a mean diameter of 100 nm, and spherical ZnO particles with a diameter of 50 nm were fully characterized by field-emission scanning electron microscope (FE-SEM), a high-resolution transmission electron microscope (HR-TEM) and X-ray diffraction (XRD). Due to the antibacterial advantages of ZnO and GO, the mechanism underlying the interaction between composites and bacteria is elucidated in this work. The results showed that the composites could prevent bacterial proliferation and could destroy bacterial integrated membrane by the release of Zn2+ and generation of abundant reactive oxygen species (ROS). The typical gram-negative (Escherichia coli and Salmonella typhimurium) and gram-positive (Bacillus subtilis and Enterococcus faecalis) bacteria were used to investigate the significant antibacterial activity of ZnO/GO composites. The minimum inhibit concentration (MIC) value of ZnO/GO composites for the gram-positive bacteria was 31.25 ± 0.25 μg/mL, however, that for the gram-negative bacteria was 15.625 ± 0.5 μg/mL. Based on our study, this new structure composites with good antibacterial activity is regarded as a promising material for application in the medical field.}, journal={JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY}, author={Zhong, Linlin and Liu, Huifang and Samal, Monica and Yun, Kyusik}, year={2018}, month={Jun}, pages={293–301} }
 @article{zhong_samal_yun_2018, title={Synthesis, characterization and electrochemical properties of different morphological ZnO anchored on graphene oxide sheets}, volume={204}, ISSN={["1879-3312"]}, DOI={10.1016/j.matchemphys.2017.10.062}, abstractNote={In this study, we reported an optimized facile method to synthesize ZnO particles of three kinds of morphologies, flower-like, rod-like and sphere. Although ZnO grew along the a- and c-axes, however, the anisotropic crystal growth mechanism of ZnO particles was investigated by the ratio of precursor and temperature of the reaction. The characterizations of three ZnO particles were measured by Field-emission scanning electron microscopy, Fourier-transform infrared spectroscopy and X-ray diffraction. In addition, ZnO with three shapes was fixed on gold-printed circuit board to detect their electrochemistry property in a 3% H2O2/phosphate buffer, while ZnO/GO (graphene oxide) composite was obtained by organic linking which showed the different electrochemical results compare to that of ZnO. electron-transfer distance and speed have been changed between the products and support due to the combination of ZnO and GO. The exploration of ZnO of different shape and ZnO/GO composites on their features and properties would provide significant evidence for their application as sensors in extensive fields.}, journal={MATERIALS CHEMISTRY AND PHYSICS}, author={Zhong, Linlin and Samal, Monica and Yun, Kyusik}, year={2018}, month={Jan}, pages={315–322} }