Self‐Assembly of 2D Nanosheets into 1D Nanostructures for Sensing NO₂

Abstract

Ultrathin 2D nanosheets are one of the appealing building blocks for constructing self‐assembled nanostructures. Herein, a facile, fast, and general solvent‐mediated route for the high‐yield and large‐scale self‐assembly of ultrathin 2D nanosheets into 1D nanofibers and nanorings is reported. Solution‐dispersed graphene oxide (GO), MoS2, TiS2, and TaS2 nanofibers with lengths of several tens of micrometers and diameters of 20–50 nm are formed via the self‐assembly of their corresponding single‐layer nanosheets by simply vibrating their tetrahydrofuran suspensions under vortex for 1 min at room temperature. Interestingly, by simply changing the solvent from tetrahydrofuran to acetone, nanorings with diameters of 200–500 nm can be obtained via a similar process. As a proof‐of‐concept application, the reduced GO (rGO) nanofibers obtained by thermal reduction of the GO nanofibers are used as the channel material to fabricate electronic gas sensor, showing good sensitivity (with a detection limit of ≈75 ppb) and selectivity toward NO2. The simple assembly strategy can be used to assemble other ultrathin 2D nanomaterials into 1D nanostructures for various promising applications.

Ligand-assisted deposition of ultra-small Au nanodots on Fe2O3/reduced graphene oxide for flexible gas sensors

“…S7 in the ESI†), which enabled facile electron transfer across the Au/α-Fe 2 O 3 interface, leading to the formation of additional electron vacancies in α-Fe 2 O 3 and thus an enhanced sensitivity. In addition, our Au ND–ODT/α-Fe 2 O 3 /rGO-based sensor exhibits performance comparable to that of many previously reported RT NO 2 gas sensors (see Table S1 in the ESI†) 53–61 and outperforms the recently reported rGO nanofiber, 54 Au–CuO 59 and MoS 2 (ref. 60) based sensors.…”

Metallic phase WSe2 nanoscrolls for the hydrogen evolution reaction

“…[25][26][27] Additionally, previous studies have shown that graphene and graphene-like two-dimensional nanosheets can curl spontaneously to form nanoscroll-structured materials with excellent physicochemical properties for applications in sensors, electronics, energy storage, electrocatalysis, etc. [28][29][30][31][32][33][34][35][36] Motivated by these observations, it would also be interesting to figure out whether metallic WSe 2 (M-WSe 2 ) nanosheets can also form the nanoscrolls via a spontaneous curling process. However, it is still quite challenging to construct metastable metallic phase TMD nanomaterials owing to their thermodynamic metastable nature.…”

A novel electrochemical sensor for glyphosate detection based on Ti3C2Tx/Cu-BTC nanocomposite

“…Introduction of 2D nanosheet into basic material could supply good sensitivity since 2D nanomaterials are used as the channel material to fabricate sensor. 50 Therefore by combining Ti 3 C 2 T x with high conductivity and Cu-BTC, the conductivity of Cu-BTC can be greatly improved, the response current and current change value can be increased, and the sensing signal can be significantly amplified.…”