Natural Biomass as Carbon Sources for the Synthesis of Photoluminescent Carbon Dots

Abstract

Photoluminescent carbon dots (CD), one of the nanomaterial family members with a size of < 10 nm, have become increasingly popular in the past decade due to its unique optical and electric properties. Semiconductor quantum dots that were developed in the earlier years consist of toxic heavy metal elements in its structure, thus rendering it to be applied in environmental and biological application. Due to this drawback, CD acts as promising alternatives to overcome this shortcoming. Over and above, CD presented low toxicity, high biocompatibility, ease of functionalization, and tunable luminescence. Respectively, CD has shown a great potential to be widely applied in various application. In this chapter, a brief summary of CD background was discussed. The use of natural carbon-based materials as a starting material and different approaches on the preparation of CD were summarized. A summary of CD structure and properties was also discussed briefly.

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

“…Innumerable food-containing carbon sources can be employed to synthesize CDs with different QYs, e.g., yoghurt, honey, banana, pomegranate, leaves, sugar beet molasses, egg, rice bran, garlic, coffee beans, soybeans, coconut shell, tea leaves, grass, etc. [93][94][95][96][97][98][99][100][101]. Additionally, various green approaches for one-step synthesis of fluorescent CDs can be obtained using natural or synthetic non-toxic precursors for specific biosensing purposes, e.g., wool for synthesizing CDs to detect glycophosphate [102], sodium fluoride functionalized chitosan for preparing CDs to determine the retinoic acid content [103], etc.…”

A Mineração E O Uso Dos Minerais Em Elementos Do Cotidiano: O Smartphone

“…Recentemente, sínteses de CDs alinhadas com os princípios da química verde tem ganhado espaço (JAMALUDIN; RASHID; TAN, 2018; KHAN; SAEED; KHAN, 2019). Esse processo de síntese verde visa evitar ou limitar a necessidade de produtos químicos, longo tempo de reação, e etapas de preparação tediosa, além de oferecer benefícios econômicos e ambientais em comparação com os produtos químicos e físicos de métodos convencionais (FENG et al, 2021;JAMALUDIN;RASHID;TAN, 2018). Atualmente, o processo de síntese verde para produção de CDs inclui, principalmente, carbonização hidrotérmica, irradiação de microondas, tratamento de ultra-som e oxidação de ozônio/peróxido de hidrogênio de fontes de carbono baseadas em biomassa.…”

Квантовые Точки: Свой­ства, Технологии, Рынок

“…В качестве источников натурального углерода для графеновых или углеродных КТ в литературе описаны такие материалы, как соевое молоко, яйца, чеснок, кофейные продукты, мед, оболочки креветок. В работе [18] особое внимание с этой точки зрения уделено биоуглю. Показаны Известно тропическое растение шпороцветник ароматный или плектрантус ароматный (plectranthus amboinicus).…”