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金属衬底上单层MoS2的可控批量制备是探索其微观形貌、新奇物理化学特性以及潜在应用的重要前提. 最近, 我们利用低压化学气相沉积的方法, 在多晶金箔上实现了高质量、大面积/大批量、畴区尺寸可调(从几百纳米到几十微米)单层MoS2的可控制备; 利用低能电子显微/衍射实现了直接生长的单层MoS2畴区取向和畴区边界的原位识别; 利用金箔上合成的纳米尺寸MoS2作为电催化析氢反应的催化剂, 实现了高效的析氢效果(塔菲尔斜率约61 mV/dec, 交换电流密度约38.1 μA/cm2). 本文将以这些研究成果为主线, 系统地阐述金箔上单层MoS2的可控制备和转移、畴区的原位识别以及在电催化析氢反应中的应用, 并对该领域的未来发展趋势和所面临的挑战进行简要的展望. 相似文献
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Anisotropic electrical conductivity,phase transition and thermal hysteresis of a charge-transfer salt dibutylammonium bis-7,7,8,8-tetracyanoquinodimethane DBA(TCNQ)2
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This paper reports that a charge-transfer salt dibutylammonium bis-7,7,8,8-tetraeyanoquinodimethane [DBA (TCNQ)2] has been prepared. The temperature dependences of the DC electrical conductivity of the DBA (TCNQ)2 single crystal measured along the crystallographic a, b, and c axes are reported. The crystal shows semicondueting behaviour and the room-temperature conductivities are highly anisotropic (σa = 3.63× 10^-4S/cm, σb = 2.84× 10^-6S/cm, and (σe = 1.82 × 10^-5S/cm). Particularly, a sharp semiconductor to semiconductor transition has been observed around 270 K on the resistivity curves measured under cooling and heating. In addition, thermal hysteresis phenomena on conductivity and differential scanning calorimetry curves are also reported. 相似文献
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