Unravel the interaction of protoporphyrin IX with reduced graphene oxide by vital spectroscopic techniques.
Probing interaction between dyes and reduced graphene oxide (rGO) is of contemporary research interest. Since, rGO is widely used as electron acceptor in photovoltaic and optoelectronic devices. Hence, we have investigated the interaction between protoporphyrin IX (PPIX) and rGO by vital spectroscopic techniques. The adsorption of PPIX on rGO is studied by Attenuated total reflection-Fourier transform infrared (ATR-FTIR) and X-ray photoelectron spectroscopic (XPS) measurements. The fluorescence quenching measurements are also performed and the fluorescence intensity of PPIX is quenched by rGO. The quenching of PPIX with rGO is evaluated by the Stern-Volmer equation and time-resolved fluorescence lifetime studies. The results revealed that the fluorescence quenching of PPIX with rGO is due to the static quenching mechanism. The dominant process for this quenching has been attributed to the process of electron transfer from excited state PPIX to rGO. Fluorescence lifetime measurements were used to calculate the rate of electron transfer process between excited state of PPIX and rGO. Transient absorption studies demonstrated the formation of PPIX cation radical for the evidence of electron transfer between PPIX and rGO.
Department of Chemistry, B.S. Abdur Rahman University, Chennai 600 048, Tamil Nadu, India.
Mariadoss Asha
MA
Jhonsi
Department of Energy and Environment, National Institute of Technology, Tiruchirappalli 620 015, Tamil Nadu, India.
Chandrasekaran
C
Nithya
National Centre for Ultrafast Processes, University of Madras, Taramani Campus, Chennai 600 113, Tamil Nadu, India. Electronic address: akathir23@gmail.com.
Arunkumar
A
Kathiravan
Electron transfer; Fluorescence quenching; Protoporphyrin IX; Reduced graphene oxide; Time correlated single photon counting