Paper SS+AS+EM-WeA10
Adsorption of C₆₀ Buckminster Fullerenes on a Carbon-free Hydrazine-modified Silicon Surface

Wednesday, November 9, 2016, 5:20 pm, Room 104D

Buckminster fullerene C₆₀ was used as a model to understand the attachment chemistry of large molecules on amine-terminated semiconductor surfaces. The resulting interface may serve as a foundation for devices in such fields as solar energy conversion, biosensing, catalysis, and molecular electronics. In this work, a monolayer of buckminster fullerenes C₆₀ was covalently attached to silicon surfaces using an efficient wet chemistry method. The starting chlorine-terminated Si(111) surface was initially modified with hydrazine to produce NH-NH functionality. Then the C₆₀ fullerenes were reacted directly with this surface. The chemical state and surface topography of the C₆₀-modified surface were characterized by surface analytical spectroscopic and microscopic methods, including X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and atomic-force microscopy (AFM). The experimental results were also supported by computational investigation, density functional theory (DFT) calculations, that were performed to predict core-level energies of surface species formed and to propose the possible mechanism of surface reactions.