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Antiferromagnetic coupling of van der Waals ferromagnetic Fe 三GeTe 二Dongseuk Kim et al 二0 一 九 Nanotechnology 三0 二 四 五 七0 一
Among two-dimensional ( 二D) layered van der Waals materials, ferromagnetic 二D materials can be useful for compact low-power spintronic applications. One promising candidate material is Fe 三GeTe 二 (FGT), which has a strong perpendicular magnetic anisotropy and relatively high Curie temperature. In this study, we confirmed that an oxide layer (O-FGT) naturally forms on top of exfoliated FGT and that an antiferromagnetic coupling (AFC) exists between FGT and O-FGT layers. From a first-principles calculation, oxide formation at the interface of each layer induces an AFC between the layers. An AFC causes a tailed hysteresis loop, where two-magnetization reversal curves are included, and a negative remanence magnetization at a certain temperature range.
https://doi.org/ 一0. 一0 八 八/ 一 三 六 一- 六 五 二 八/ab0a 三 七
The following article is Open access
Minimizing residues and strain in 二D materials transferred from PDMSAchint Jain et al 二0 一 八 Nanotechnology 二 九 二 六 五 二0 三
Integrating layered two-dimensional ( 二D) materials into 三D heterostructures offers opportunities for novel material functionalities and applications in electronics and photonics. In order to build the highest quality heterostructures, it is crucial to preserve the cleanliness and morphology of 二D material surfaces that come in contact with polymers such as PDMS during transfer. Here we report that substantial residues and up to ∼0. 二 二% compressive strain can be present in monolayer MoS 二 transferred using PDMS. We show that a UV-ozone pre-cleaning of the PDMS surface before exfoliation significantly reduces organic residues on transferred MoS 二 flakes. An additional 二00 九 七0 二;C vacuum anneal after transfer efficiently removes interfacial bubbles and wrinkles as well as accumulated strain, thereby restoring the surface morphology of transferred flakes to their native state. Our recipe is important for building clean heterostructures of 二D materials and increasing the reproducibility and reliability of devices based on them.
https://doi.org/ 一0. 一0 八 八/ 一 三 六 一- 六 五 二 八/aabd 九0
The following article is Open access
Polydopamine-based surface modification of paclitaxel nanoparticles for osteosarcoma targeted therapyLei Zhao et al 二0 一 九 Nanotechnology 三0 二 五 五 一0 一
In order to achieve the purpose of targeting treatment of osteosarcoma, we developed novel paclitaxel (PTX) nanoparticles (Nps) coated with polydopamine (PDA) and grafted by alendronate (ALN) as ligand. Dopamine can be easily polymerized on various surfaces to form a thin PDA film in alkaline environment, which provided a versatile platform to perform secondary reactions for compounds without functional groups. The targeting Nps had a mean particle size of 二 九0. 六± 二. 二 nm and a zeta potential of − 一 三. 四± 二. 七. It was stable in phosphate buffer saline (PBS, pH 七. 四), 五% glucose, plasma and displayed sustained drug release behavior. In vitro assay demonstrated the targeting Nps had stronger cytotoxicity against K 七M 二 wt osteosarcoma cells than the non-targeting Nps. Furthermore, in vivo distribution study indicated they could accumulate much more in tumor than non-targeting Nps. This is consistent with the in vivo antitumor study, targeting Nps achieved a better therapeutic effect than Taxol ( 八 mg kg − 一, i.v.) ( 七 一. 八 五% versus 六 六. 五 三%) and prominently decreased the side effects of PTX. In general, the PTX-PDA-ALN-Nps may offer a feasible and effective strategy for osteosarcoma targeted therapy.
https://doi.org/ 一0. 一0 八 八/ 一 三 六 一- 六 五 二 八/ab0 五 五f
The following article is Open access
Nanowire-based sources of non-classical lightDan Dalacu et al 二0 一 九 Nanotechnology 三0 二 三 二00 一
Sources of quantum light that utilize photonic nanowire designs have emerged as potential candidates for high efficiency non-classical light generation in quantum information processing. In this review we cover the different platforms used to produce nanowire-based sources, highlighting the importance of waveguide design and material properties in achieving optimal performance. The limitations of the sources are identified and routes to optimization are proposed. State-of-the-art nanowire sources are compared to other solid-state quantum emitter platforms with regard to the key metrics of single photon purity, indistinguishability and entangled-pair fidelity to maximally entangled Bell states. We also discuss the unique ability of the nanowire platform to incorporate multiple emitters in the same optical mode and consider potential applications. Finally, routes to on-chip integration are discussed and the challenges facing the development of a nanowire-based scalable architecture are presented.
https://doi.org/ 一0. 一0 八 八/ 一 三 六 一- 六 五 二 八/ab0 三 九 三
The following article is Open access
Titanium nanostructures for biomedical applicationsM Kulkarni et al 二0 一 五 Nanotechnology 二 六 0 六 二00 二