Dong Y., Gong M., Shah F. U., Laaksonen A., An R., Ji X. Phosphonium-Based Ionic Liquid Significantly Enhances SERS of Cytochrome c on TiO2Nanotube Arrays. 2022. ACS Applied Materials and Interfaces. 14. 23. 27456-27465. 10.1021/acsami.2c05781