Barlow Dan, Scudiero Louis, Hipps K W
Department of Chemistry and Materials Science Program, Washington State University, Pullman, WA 99164-4630, USA.
Ultramicroscopy. 2003 Oct-Nov;97(1-4):47-53. doi: 10.1016/S0304-3991(03)00029-9.
Bilayer and trilayer organic films grown on Au(111) were studied by scanning tunneling microscopy (STM). Studies were carried out under UHV conditions with the sample cooled to either 80 or 100K. Cobalt(II)phthalocyanine [CoPc] was deposited from vapor onto Au(111), followed by vanadyl phthalocyanine, VOPc. CoPc coverages studied were 0.5 and 1 monolayer, while VOPc coverages were about 0.5 monolayer. Constant current images were acquired at high tunneling gap resistance, of the order of 30GOmega. Two different physical structures were observed for VOPc on CoPc, and each had a characteristic I(V) curve indicating significantly different unoccupied state density. It is also demonstrated that the transmission factor for two layers of VOPc is not simply the product of the transmission factors for each layer.
通过扫描隧道显微镜（STM）对生长在Au(111)上的双层和三层有机薄膜进行了研究。研究在超高真空条件下进行，样品冷却至80K或100K。钴（II）酞菁[CoPc]从气相沉积到Au(111)上，随后沉积钒氧基酞菁（VOPc）。所研究的CoPc覆盖度为0.5和1个单层，而VOPc覆盖度约为0.5个单层。在约30GΩ的高隧穿间隙电阻下采集恒流图像。观察到VOPc在CoPc上有两种不同的物理结构，每种结构都有特征性的I(V)曲线，表明未占据态密度有显著差异。还证明了两层VOPc的传输因子并非简单地是每层传输因子的乘积。
