Porous matrix materials in optical sensing of gaseous oxygen

Abstract

The review provides comparison of porous materials that act as a matrix for luminescent oxygen indicators. These include silica-gels, sol–gel materials based on silica and organically modified silica (Ormosils), aerogels, electrospun polymeric nanofibers, metal–organic frameworks, anodized alumina, and various other microstructured sensor matrices. The influence of material structure and composition on the efficiency of oxygen quenching and dynamic response times is compared and the advantages and disadvantages of the materials are summarized to give a guide for design and practical application of sensors with desired sensitivity and response time. Graphical abstract

Critical review of polymer and hydrogel deposition methods for optical and electrochemical bioanalytical sensors correlated to the sensor’s applicability in real samples

“…Compared to the other methods, electrospinning enables the easy production of very thin films with a large surface-to-volume ratio due to the extended porosity [45]. Especially for gas-sensing devices, the high porosity leads to an unexpected increase in sensitivity compared to other materials [67]. Several analytical applications are described where doping of the polymer solution enables the immediate generation of as-use sensing nanofibers such as those made of cellulose acetate fibers doped with fluorescence probes where the high surface area afforded through the fiber structure lowered the LOD for biogenic amines by an order of magnitude in comparison to deposited films [29].…”

Latest advances in sensors for optical detection of relevant amines: insights into lanthanide-based sensors

“…Colorimetric sensor elements incorporated into high-surface-area materials provide simple, inexpensive, and sensitive ways to detect dilute pollutants or toxicants. 88 Mesoporous silica materials are attractive host materials for such applications, as they possess high surface areas, relatively large pores, uniform pore-size distributions, high loading capacity, abundant chemical versatility, acceptable biocompatibility and excellent hydrothermal stability. 89 In the preparation of silica materials, the most used silica precursors were tetraethyl orthosilicate (TEOS) and (3-aminopropyl)triethoxysilane (APTES).…”

On the Use of Polymer-Based Composites for the Creation of Optical Sensors: A Review

“…Electrospun nanofibers are relatively new materials in optical sensors development, since they have been used in the last 10–15 years. They are quite diverse from a chemical point of view, but at the same time they satisfy one of the main requirements for composite materials—customizability of structure and composition combined with a fairly high versatility [ 140 ]. For example, a membrane was made for simultaneous measurement of pH and dissolved O 2 (DO) [ 141 ].…”

“…Due to the developed uniform inner surface of mesoporous materials [ 156 ], their use in optical sensors makes it possible to achieve linear calibration [ 140 , 162 ]. However, in some cases, such as measurement in the environment with high biomass content, such materials can facilitate biofouling and degrade response time and performance over time [ 167 ].…”