Near-infrared absorption gas sensing with metal-organic framework on optical fibers

Plasmonic nanopatch array with integrated metal–organic framework for enhanced infrared absorption gas sensing

“…At high concentration, most of the gas molecules are physically adsorbed inside the MOF pores, which are limited by the available space. While at low concentration CO 2 , chemical bond adsorption becomes dominant [7,8], which can provide a large gas concentration factor.…”

“…MOFs are extended crystalline structures consisting of metal ions connected by organic ligands, which can essentially possess an infinite number of possible combinations with different physical and chemical properties. Therefore, MOFs have been widely applied in chemical separation [1], gas storage [2][3][4][5], drug delivery [6], sensing [7][8][9][10], and catalysis [11][12][13][14] applications. In recent years, hybrid plasmonic-MOF nanostructures have been reported to take the advantages of the strong gas adsorption capabilities of MOF materials and the optical field enhancement of plasmonics effect.…”

Metal–Organic Framework Thin Films: Fabrication, Modification, and Patterning

“…Wannapaiboon et al [51] developed a direct fabrication strategy of MOF-TFs, with the hierarchical structure on the surface of QCM sensors, via an LBL-LPE process, which allows the adsorption performances of the heterostructures to probe in real time. Other than planar substrates, the fabrication of uniform and continuous MOF-TFs can also be made on arched surfaces, such as optical fibers [42], via the LBL deposition manner.…”

“…Nowadays, MOFs are available in various structures, such as nanocrystals (NCs) [27], nanospheres [28], nanosheets [29], needles [30], hierarchical monoliths [31], thin films (TFs) [32], membranes [33], and glasses [34][35][36]. Among these structures, MOF-TFs are drawing increasing attention due to their tremendous potential in the development of nanotechnology-enabling applications, such as optics [37], photonics [38], electronics [39], catalytic coatings [40], sensing [41][42][43][44], solar cell [45], battery [46], and supercapacitor [44]. One thing to notice is that MOF-TFs cannot be differentiated from MOF membranes by their chemical composition or by their selection of substrates.…”

“…The selection of substrate is crucial in the fabrication of MOF-TFs, especially in the deposition process based on hydro/solvothermal mother solution synthesis that requires good heterogeneous nucleation and growth of MOFs. To date, the fabrication of MOF-TFs has been realized on various substrates, such as nonplanar substrates [56], planar substrates [57], flexible substrates [42,58], and substrates terminated with different functional groups on the surface [59,60]. In spite of these extensive studies, engineering MOF-TFs with a controllable thickness and structure and precise chemical composition has always been a challenge.…”