Nanomaterial-Integrated Cellulose Platforms for Optical Sensing of Trace Metals and Anionic Species in the Environment

Abstract

The development of disposable sensors that can be easily adapted to every analytical problem is currently a hot topic that is revolutionizing many areas of science and technology. The need for decentralized analytical measurements at real time is increasing for solving problems in areas such as environment pollution, medical diagnostic, food quality assurance, etc., requiring fast action. Despite some current limitations of these devices, such as insufficient detection capability at (ultra)trace level and risk of interferent effects due to matrix, they allow low-cost analysis, portability, low sample consumption, and fast response. In the last years, development of paper-based analytical devices has undergone a dramatic increase for on-site detection of toxic metal ions and other pollutants. Along with the great availability of cellulose substrates, the immobilization of receptors providing enhanced recognition ability, such as a variety of nanomaterials, has driven the design of novel sensing approaches. This review is aimed at describing and discussing the different possibilities arisen with the use of different nanoreceptors (e.g., plasmonic nanoparticles, quantum dots, carbon-based fluorescent nanoparticles, etc.) immobilized onto cellulose-based substrates for trace element detection, their advantages and shortcomings.

Paper-Based Analytical Devices for Colorimetric and Luminescent Detection of Mercury in Waters: An Overview

“…The so-called paper-based analytical devices (PADs) have arisen as an efficient, affordable, user-friendly, rapid, and equipment-free technology that is available to citizens. The development of PADs in areas such as clinical diagnostics, food safety and environmental monitoring, etc., as well as fabrication methods, target analytes and analytical performance, has been extensively reviewed during the last decade [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], with the scientific community showing great interest toward these appealing analytical approaches. The so-called paper-based analytical devices (PADs) have arisen as an efficie fordable, user-friendly, rapid, and equipment-free technology that is available to ci The development of PADs in areas such as clinical diagnostics, food safety and en mental monitoring, etc., as well as fabrication methods, target analytes and analytic formance, has been extensively reviewed during the last decade [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], with the sc community showing great interest toward these appealing analytical approaches.…”

“…Unlike other pollutants, heavy met not biodegradable and can bioaccumulate in living beings, causing toxicity even present at ultratrace levels in the environment. According to WHO [40], Hg is cons as one of the top 10 chemicals or groups of chemicals of major public health concer hough several review papers have appeared in the literature dealing with applicat PADs for the detection of heavy metals [34,37], no specific one has been published r to Hg, an element for which there has been a sharp increase in applications over t five years. Figure 2 shows the percentage of publications related to applications of μ and paper-based sensors to the detection of Hg(II) in the environmental field using imetric and luminescent signal readout.…”

Intrinsic Blue Fluorescence of 2.0G PAMAM-DCM Polymer Dots and Its Applications for Fe3+ Sensing

“…Meanwhile, PCDs, as a fluorescence sensor, [26,27] show great applications in environmental sciences [28,29], chemical analysis [30], and biological fields [31][32][33]. In contrast to the instrumental detection of metal ions, PD fluorescence sensors are simple, portable, highly efficient, and fast-responding [34].…”

Cr2O3–TiO2-Modified Filter Paper-Based Portable Nanosensors for Optical and Colorimetric Detection of Hydrogen Peroxide

“…Following the invention of paper chromatography in the early 21st century, diagnostic devices based on paper began to emerge. 37 Keeping in view these factors, filter paper was used in this study. Filter paper was modified as a transducer surface with Cr 2 O 3 –TiO 2 nanocomposites encapsulated in sol–gel.…”