CarboliteGero卡博莱特盖罗TZF 高温管式炉

汞齐等合金在齿科或不锈钢领域有着广泛应用，传统制备方式是高温熔融而成。如果制备量很少，或者高温无法熔融样品，那么则要选择机械 方式制备。——球磨仪就是一个理想的选择方案。球磨仪能在研磨过程中提供撞击力和摩擦力，机械合成法也非常适用于机械化学，如引发 非溶剂环境下的化学反应。

Monolayers of transition metal dichalcogenides (TMDCs) are atomically thin directgap semiconductors with potential applications in nanoelectronics, optoelectronics, and electrochemical sensing. Recent theoretical and experimental efforts suggest that they are ideal systems for exploiting the valley degrees of freedom of Bloch electrons. For example, Dirac valley polarization has been demonstrated in mechanically exfoliated monolayer MoS2 samples by polarization-resolved photoluminescence, although polarization has rarely been seen at room temperature. Here we report a new method for synthesizing high optical quality monolayer MoS2 single crystals up to 25 μm in size on a variety of standard insulating substrates (SiO2, sapphire, and glass) using a catalyst-free vapor
solid growth mechanism. The technique is simple and reliable, and the optical quality of the crystals is extremely high, as demonstrated by the fact that the valley polarization approaches unity at 30 K and persists at 35% even at room temperature, suggesting a virtual absence of defects. This will allow greatly improved optoelectronic TMDC monolayer devices to be fabricated and studied routinely.