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Zuzana Šimonová,Ludmila Porubová,Adam Verner,Roman Gabor,Zuzana Vilamová,Edmund Dobročka,Miroslav Cieslar,Veronika Krbečková,Kateřina Peterek Dědková,Ladislav Svoboda,Jiří Bednář,Richard Dvorský,Jana 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
Our simple technique of polymer/metal-based material preparation produces very promising material, and weoutline that this material can be suitable for the potential wound healing multilayered dressing. In our research we focused onthese main issues: (1) the preparation of silver nanowire-like structures using gallic acid (GA); (2) direct silver nanowire-likestructure crystallization of co-polymer L-lactide and ε-caprolactone (PLCL) electrospun fiber and (3) evaluation of thematerial cytotoxicity on the Vero cell line. Synthesized silver nanowire-like width varied from 30 to 100 nm and thehexagonal particles had sizes from 80 to 300 nm. The detected structures were crystalline cubic silver and were similarlysynthesized during both batch synthesis and direct synthesis on the PLCL fibers. The amount of the silver spread within thefibrous membrane was approximately 1.1 wt. % in the sample, moreover, the silver incorporation had no influence on thepolymer structure, which was confirmed by FTIR measurement. The cytotoxicity testing estimated that cell survivalincreased with decreased concentration of GA and silver in the PLCL matrix and the silver-based sample in 50 % MTTextraction concentration maintained required non-cytotoxic properties.
Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn<sup>2+</sup> quantum nanoribbons
Yu, Jung Ho,Liu, Xinyu,Kweon, Kyoung Eun,Joo, Jin,Park, Jiwon,Ko, Kyung-Tae,Lee, Dong Won,Shen, Shaoping,Tivakornsasithorn, Kritsanu,Son, Jae Sung,Park, Jae-Hoon,Kim, Young-Woon,Hwang, Gyeong S.,Dobro Nature Publishing Group 2010 Nature Materials Vol.9 No.1
Doping of semiconductor nanocrystals by transition-metal ions has attracted tremendous attention owing to their nanoscale spintronic applications. Such doping is, however, difficult to achieve in low-dimensional strongly quantum confined nanostructures by conventional growth procedures. Here we demonstrate that the incorporation of manganese ions up to 10% into CdSe quantum nanoribbons can be readily achieved by a nucleation-controlled doping process. The cation-exchange reaction of (CdSe)<SUB>13</SUB> clusters with Mn<SUP>2+</SUP> ions governs the Mn<SUP>2+</SUP> incorporation during the nucleation stage. This highly efficient Mn<SUP>2+</SUP> doping of the CdSe quantum nanoribbons results in giant exciton Zeeman splitting with an effective g-factor of ∼600, the largest value seen so far in diluted magnetic semiconductor nanocrystals. Furthermore, the sign of the s–d exchange is inverted to negative owing to the exceptionally strong quantum confinement in our nanoribbons. The nucleation-controlled doping strategy demonstrated here thus opens the possibility of doping various strongly quantum confined nanocrystals for diverse applications.