Abstract X-ray photoelectron spectroscopy (XPS) is a spectroscopic technique that is surface-sensitive that can be used to analyze the chemical and elemental state of a sample on the surface. In this research, XPS was used to study the chemical interaction of gold/nanocrystalline cellulose-graphene oxide (gold/NCC-GO) thin film. The thin film was prepared by deposition of NCC-GO on a gold thin film using spin coating method to obtain a homogeneous gold/NCC-GO thin film before characterized by XPS. From the XPS results, it is confirmed that carbon, oxygen, nitrogen, and sulfur elements exist on the gold/NCC-GO thin film surface. Further deconvolution has also been carried out by Voigt curve fitting program in order to determine the sub-peak component of each elements. Besides that, the gold/NCC-GO thin film has potential to be used in sensing metal ion application. The interaction of metal ions with the gold/NCC-GO thin film was optically proven using surface plasmon resonance optical sensor before the thin film was characterized again by XPS to confirm the chemical interactions involved. It is believed that the existence negative charge functional groups, i.e., COO− and SO3− on the gold/NCC-GO thin film surface played an important role during the interaction.

中文翻译：

---

金/纳米晶纤维素-氧化石墨烯薄膜作为金属离子检测表面等离子体共振活性层的 X 射线光电子研究

摘要 X 射线光电子能谱 (XPS) 是一种表面敏感的光谱技术，可用于分析样品表面的化学和元素状态。在本研究中，XPS 用于研究金/纳米晶纤维素-氧化石墨烯（金/NCC-GO）薄膜的化学相互作用。该薄膜是通过使用旋涂法在金薄膜上沉积 NCC-GO 来制备的，以获得均匀的金/NCC-GO 薄膜，然后通过 XPS 进行表征。XPS 结果表明，金/NCC-GO 薄膜表面存在碳、氧、氮和硫元素。Voigt曲线拟合程序还进行了进一步的解卷积，以确定每个元素的子峰分量。除此之外，金/NCC-GO 薄膜具有用于传感金属离子应用的潜力。金属离子与金/NCC-GO 薄膜的相互作用在薄膜再次通过 XPS 表征以确认所涉及的化学相互作用之前，使用表面等离子体共振光学传感器进行了光学证明。相信金/NCC-GO薄膜表面存在的负电荷官能团，即COO-和SO3-在相互作用过程中起重要作用。