Efficient Quenching of Two-Photon Absorption Induced Photoluminescence in Carbon Nanodots for Fe³⁺ Ion Detection.

ABSTRACT: This study reports on the linear and nonlinear optical (NLO) properties of water-dispersed carbon nanodots (CNDs) fabricated via a rapid one-step hydrothermal microwave-assisted technique. The CNDs exhibit two-photon excited luminescence, which was characterized with spectrally tunable femtosecond laser pulses as involving the two-photon absorption (TPA) cross sections (σ₂) as large as 1.4 × 10³ Goeppert-Mayer (GM) at the excitation wavelength of 720 nm and the quantum yield (QYs) of 28%. By analyzing the σ₂ spectra, specific wavelength ranges optimal for excitation via the two-photon process were identified. In addition, the potential of the CNDs as sensors for the selective and sensitive detection of Fe³⁺ ions through one- and two-photon induce

SUBMITTER: Siomra A 

PROVIDER: S-EPMC12242630 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature