Color-tunable luminescent CdTe quantum dot membranes based on bacterial cellulose (BC) and application in ion detection

Abstract

Color-tunable luminescent membranes CdTe QDs on the bacterial cellulose (BC) nanofibers were successfully fabricated by in situ synthesis in aqueous solution. No nitrogen protection and expensive reagents are needed during the preparation process. The luminescent color of CdTe/BC nanocomposite membranes with green, orange and red luminescence can be tuned easily by controlling reaction time. The prepared CdTe/BC nanocomposites were characterized by X-ray diffraction (XRD), field effect scanning electron microscopy with energy dispersive X-ray analysis (FESEM-EDX) and transmission electron microscope (TEM). Ultravioletvisible (UV-vis), photoluminescence (PL) spectra and PL quantum efficiency (PL QE) 2 were used to investigate the optical properties. Moreover, we attempted to make the luminescent membranes as ion test paper. The green luminescent membranes had a good selectivity for Cu 2+ with the detection limit of 0.016 mM and the mechanism of quenching Cu 2+ were also explored. This work provides a simple, effective and eco-friendly method for the construction of luminescent CdTe QDs on BC membranes with high detectability for detection Cu 2+ .

Macrofibers with High Mechanical Performance Based on Aligned Bacterial Cellulose Nanofibers

“…Gluconacetobacter xylinus were incubated with basal medium (glucose 5 wt %, yeast extract 0.5 wt %, bacto-peptone 0.5 wt %, disodium phosphate 0.2 wt %, monopotassium phosphate 0.1 wt %, and citric acid 0.1 wt %) for 5 d in a static culture, adjusted to pH 5.0. Then BC membranes were boiled in 1 wt % NaOH for 60 min, to get rid of the remaining culture medium and microorganisms, and then repeatedly rinsed with pure water until the filtrate became neutral . Finally, BC was fibrillated into slurry by high-shear homogenization at speed of 7000 rpm for 15 min and then stored at 4 °C before use.…”

“…Then BC membranes were boiled in 1 wt % NaOH for 60 min, to get rid of the remaining culture medium and microorganisms, and then repeatedly rinsed with pure water until the filtrate became neutral. 30 Finally, BC was fibrillated into slurry by high-shear homogenization at speed of 7000 rpm for 15 min and then stored at 4 °C before use.…”

Characterization of Hydrothermal Deposition of Copper Oxide Nanoleaves on Never-Dried Bacterial Cellulose

“…Purified BC pellicles are transparent and durable materials that are composed of a nonwoven mat of cellulose ribbons; each BC nanoribbon is 40–60 nm wide, 10–20 nm tall, and has a crystal structure that is predominately cellulose Iα [7,8,9]. In applied nanocomposite materials, BC has been used for supercapacitors, ion detection, pH sensing, and glucose sensing [10,11,12].…”

Synthesis of Manganese Oxide Embedded Carbon Nanofibers as Effective Biomimetic Enzymes for Sensitive Detection of Superoxide Anions Released from Living Cells

“…BC is an organic compound produced by certain types of bacteria such as Acetobacter and Agrobacterium . BC has different properties from plant cellulose including high purity, ultrafine nanosize, excellent mechanical strength, and high water holding ability, which make it an excellent matrix for the synthesis of various nanomaterials . For example, Heli et al synthesized silver nanoparticles on bacterial cellulose template for visual detection of volatile compounds .…”