摘要
We apply polyelectrolyte multilayer films by consecutive alternate adsorption of positively charged polyallylamine hydrochloride and negatively charged sodium polystyrene sulfonate to the surface of graphene field effect transistors. Oscillations in the Dirac voltage shift with alternating positive and negative layers clearly demonstrate the electrostatic gating effect in this simple model system. A simple electrostatic model accounts well for the sign and magnitude of the Dirac voltage shift. Using this system, we are able to create p-type or n-type graphene at will. This model serves as the basis for understanding the mechanism of charged polymer sensing using graphene devices, a potentially technologically important application of graphene in areas such as DNA sequencing, biomarker assays for cancer detection, and other protein sensing applications.
我们使用由到 graphene 的表面的断然控告的 polyallylamine hydrochloride 和否定地控告的钠聚苯乙烯 sulfonate 的连续交替的吸附的多层的电影回答的聚合电解质效果晶体管。在迪拉克电压的摆动与轮流出现变积极、否定的层清楚地在这个简单模型系统表明静电的 gating 效果。一个简单静电的模型说明很好迪拉克电压移动的符号和大小。用这个系统，我们能随意创造 p 类型或 n 类型 graphene。这个模型用作理解控告的聚合物用 graphene 设备察觉到的机制的基础，一潜在地在象定序的 DNA 那样的区域的 graphene 的技术上重要的申请，为癌症察觉的 biomarker 试金，和察觉到应用的另外的蛋白质。
