Recent Advances of Graphene Quantum Dots in Chemiresistive Gas Sensors

Abstract

Graphene quantum dots (GQDs), as 0D graphene nanomaterials, have aroused increasing interest in chemiresistive gas sensors owing to their remarkable physicochemical properties and tunable electronic structures. Research on GQDs has been booming over the past decades, and a number of excellent review articles have been provided on various other sensing principles of GQDs, such as fluorescence-based ion-sensing, bio-sensing, bio-imaging, and electrochemical, photoelectrochemical, and electrochemiluminescence sensing, and therapeutic, energy and catalysis applications. However, so far, there is no single review article on the application of GQDs in the field of chemiresistive gas sensing. This is our primary inspiration for writing this review, with a focus on the chemiresistive gas sensors reported using GQD-based composites. In this review, the various synthesized strategies of GQDs and its composites, gas sensing enhancement mechanisms, and the resulting sensing characteristics are presented. Finally, the current challenges and future prospects of GQDs in the abovementioned application filed have been discussed for the more rational design of advanced GQDs-based gas-sensing materials and innovative gas sensors with novel functionalities.

Inulin-Coated ZnO Nanoparticles: A Correlation between Preparation and Properties for Biostimulation Purposes

“…Nano-priming has a pivotal role in sustainable agriculture [ 1 , 2 , 3 ], since it is a pillar in ameliorating the indicators of plant well-being, improving their germination rate and seedling and plant growth [ 4 ], and alleviating abiotic climate and contamination as well as biotic stresses [ 5 ]. Besides the longtime recognized properties of nanomaterials in the field of sensoristics as carbon/quantum dots [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ], as oxide or metal nanoparticles [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], in electronic devices [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], as well as in antimicrobic treatments [ 50 , 51 , 52 , 53 , 54 …”

“…Nano-priming has a pivotal role in sustainable agriculture [1][2][3], since it is a pillar in ameliorating the indicators of plant well-being, improving their germination rate and seedling and plant growth [4], and alleviating abiotic climate and contamination as well as biotic stresses [5]. Besides the longtime recognized properties of nanomaterials in the field of sensoristics as carbon/quantum dots [6][7][8][9][10][11][12][13][14][15][16][17][18][19], as oxide or metal nanoparticles [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], in electronic devices [35][36][37][38][39][40][41][42][43][44][45][46][47][48]…”