Highly selective QCM sensor based on functionalized hierarchical hollow TiO2 nanospheres for detecting ppb-level 3-hydroxy-2-butanone biomarker at room temperature

Siqi Sun, Cheng Zhao, Zhaohuan Zhang, Ding Wang, Xinru Yin, Jingting Han, Jinlei Wei, Yong Zhao, Yongheng Zhu, Yongheng Zhu