Searching for room temperature magnetic two-dimensional(2D)materials is a charming goal,but the number of satisfied materials is tiny.Strain can introduce considerable deformation into the lattice structure of 2D mate...Searching for room temperature magnetic two-dimensional(2D)materials is a charming goal,but the number of satisfied materials is tiny.Strain can introduce considerable deformation into the lattice structure of 2D materials,and thus significantly modulate their intrinsic properties.In this work,we demonstrated a remarkable strain-modulated magnetic properties in the chemical vapor deposited Cr_(2)Te_(3) nanoflakes grown on mica substrate.We found the Curie temperature of Cr_(2)Te_(3) nanoflakes can be positively and negatively modulated under tensile and compressive strain respectively,with a maximum varied value of -40 and-90 K,dependent on the thickness of samples.Besides,the coercive field of Cr_(2)Te_(3) nanoflakes also showed a significant decrease under the applied strain,suggesting the decrease of exchange interaction or the change of the magnetization direction.This work suggests a promise to employ interfacial strain to accelerate the practical application of room temperature 2D magnetics.展开更多
导电水凝胶作为可穿戴式传感器满足了机械灵活性和智能感应的基本要求.然而,它们往往遇到一些问题,如良好的机械性能和高导电性之间的不相容性、较差的抗菌能力和难以回收.在此,我们通过简单的冻融方法开发了高导电性物理交联的聚乙烯醇...导电水凝胶作为可穿戴式传感器满足了机械灵活性和智能感应的基本要求.然而,它们往往遇到一些问题,如良好的机械性能和高导电性之间的不相容性、较差的抗菌能力和难以回收.在此,我们通过简单的冻融方法开发了高导电性物理交联的聚乙烯醇/壳聚糖-植酸(PVA/CS-PA)水凝胶.PA与CS和PVA基质之间的氢键和静电作用不仅赋予了水凝胶适宜的机械性能和良好的延展性,而且还使其具备有意义的可回收特性.此外,由于PA分子的离子传导性和抗菌能力,该水凝胶表现出卓越的导电性(~0.125 S cm^(-1))和抗菌活性.这些特殊的性能使基于该水凝胶的可穿戴传感器表现出应变敏感的特性(在200%-420%的应变下,应变系数为7.21),可以监测人体的各种活动.此外,PVA/CSPA溶胶墨水可以在冰浴环境下转变为凝胶状态,这将满足柔性电路的需要,并使可穿戴式传感器更加便携.展开更多
基金supported by National Nature Science Foundation of China(Nos.51872100,21825103 and 51727809)Hubei Provincial Natural Science Foundation of China(No.2019CFA002)+1 种基金the Fundamental Research Funds for the Central University(Nos.2019kfyRCPY059,2019kfyXMBZ018 and 2020kfyXJJS050)Foundation of Shenzhen Science and Technology Innovation Committee(No.JCYJ20180504170444967).
文摘Searching for room temperature magnetic two-dimensional(2D)materials is a charming goal,but the number of satisfied materials is tiny.Strain can introduce considerable deformation into the lattice structure of 2D materials,and thus significantly modulate their intrinsic properties.In this work,we demonstrated a remarkable strain-modulated magnetic properties in the chemical vapor deposited Cr_(2)Te_(3) nanoflakes grown on mica substrate.We found the Curie temperature of Cr_(2)Te_(3) nanoflakes can be positively and negatively modulated under tensile and compressive strain respectively,with a maximum varied value of -40 and-90 K,dependent on the thickness of samples.Besides,the coercive field of Cr_(2)Te_(3) nanoflakes also showed a significant decrease under the applied strain,suggesting the decrease of exchange interaction or the change of the magnetization direction.This work suggests a promise to employ interfacial strain to accelerate the practical application of room temperature 2D magnetics.
基金supported by the Science and Technology Department of Jilin Province(20210101067JC and 20230101353JC)。
文摘导电水凝胶作为可穿戴式传感器满足了机械灵活性和智能感应的基本要求.然而,它们往往遇到一些问题,如良好的机械性能和高导电性之间的不相容性、较差的抗菌能力和难以回收.在此,我们通过简单的冻融方法开发了高导电性物理交联的聚乙烯醇/壳聚糖-植酸(PVA/CS-PA)水凝胶.PA与CS和PVA基质之间的氢键和静电作用不仅赋予了水凝胶适宜的机械性能和良好的延展性,而且还使其具备有意义的可回收特性.此外,由于PA分子的离子传导性和抗菌能力,该水凝胶表现出卓越的导电性(~0.125 S cm^(-1))和抗菌活性.这些特殊的性能使基于该水凝胶的可穿戴传感器表现出应变敏感的特性(在200%-420%的应变下,应变系数为7.21),可以监测人体的各种活动.此外,PVA/CSPA溶胶墨水可以在冰浴环境下转变为凝胶状态,这将满足柔性电路的需要,并使可穿戴式传感器更加便携.
