Rapid detection of silver ions based on luminescent carbon nanodots for multicolor patterning, smartphone sensors, and bioimaging applications

Abstract

Preparation of photoluminescent nitrogen and sulfur co-doped carbon nanodots for applications in multicolor patterning, smartphone sensors, and bioimaging is described.

Reversible Modulation of Aptamer‐Ligand Binding in RNA Light‐Up Aptamers Containing G‐Quadruplex Using Chemical Stimuli

“…The fluorescence was highly dependent on Ag + concentration and decreased gradually with increasing Ag + concentration (Figure 4a). A detection limit of 20 nM was observed for Ag + , which is better or comparable to previously reported fluorescence methods used for silver detection [28] . At 4 μM Ag + concentration nearly complete fluorescence loss of aptamer‐ligand complex was observed; thus, 4 μM Ag + was used to study concentration dependent fluorescence enhancement by further addition of cysteine (Figure 4b).…”

“…A detection limit of 20 nM was observed for Ag + , which is better or comparable to previously reported fluorescence methods used for silver detection. [28] At 4 μM Ag + concentration nearly complete fluorescence loss of aptamer-ligand complex was observed; thus, 4 μM Ag + was used to study concentration dependent fluorescence enhancement by further addition of cysteine (Figure 4b). The data show gradual fluorescence increase by increasing cysteine concentration, which was attributed to release of Ag + from RNA G-quadruplex.…”

Two-dimensional bismuth oxyselenide quantum dots as nanosensors for selective metal ion detection over a wide dynamic range: sensing mechanism and selectivity

“…The surface area of the sensor materials, the crystallinity, and the surface defects can influence the movement of electrons of the sensor materials as well as the interfacial charge transfer between the sensor and the metal ions to be probed. 11–13…”

“…The surface area of the sensor materials, the crystallinity, and the surface defects can influence the movement of electrons of the sensor materials as well as the interfacial charge transfer between the sensor and the metal ions to be probed. [11][12][13] Low-dimensional materials are among the first choices for the design of nanosensors due to their unique properties derived from the quantum mechanical size effect. 14,15 Twodimensional nanomaterials are the perfect examples of such sensors.…”

Facile synthesis of phosphorus and nitrogen co-doped carbon dots with excellent fluorescence emission towards cellular imaging

“…In recent years, various "top-down" and "bottom-up" approaches have been developed to prepare and tune the optical properties of CDs. [11][12][13][14][15] At present, several main luminescence mechanisms have been reported, including carbon nuclear state, surface state and molecular state. First, in the emission of the "carbon nuclear state", a large amount of sp 2 carbon forms a conjugated p domain, and the radiation is caused by the band gap transition in the p region.…”