Hollow Mesoporous SnO₂/Zn₂SnO₄ Heterojunction and RGO Decoration for High-Performance Detection of Acetone

Abstract

In this article, the synthesis procedure and sensing properties toward acetone of rGO-HM-SnO 2 /Zn 2 SnO 4 composites with a hollow mesoporous structure are presented comprehensively. The rGO-HM-SnO 2 /Zn 2 SnO 4 heterojunction structure is prepared through a self-sacrificial template strategy with a concise acid-assisted etching method. The as-prepared hollow mesoporous architectures are investigated by SEM, TEM, and HRTEM. The phase structure and valence state are also characterized by XRD and XPS, respectively. It is obvious that the hollow mesoporous architecture affords a large specific surface area, which can provide more reaction active sites of sensing materials significantly. Compared to the initial SnO 2 /Zn 2 SnO 4 composites, the gas sensor fabricated by rGO-HM-SnO 2 /Zn 2 SnO 4 shows the best gas-sensing properties, and the response value toward 100 ppm acetone is as high as 107 at 200 °C. Moreover, the rGO-HM-SnO 2 /Zn 2 SnO 4 sensing material reveals excellent properties of shorter response−recovery times and higher long-term stability. This excellent performance can be ascribed to the synergistic effect of the hollow mesoporous n−n heterojunction and abundant-defect rGO. The relevant sensing mechanism of rGO-HM-SnO 2 /Zn 2 SnO 4 sensing materials is investigated in detail.

Toward Rational Design of Ordered Heterostructures for Energy and Environmental Sustainability: A Review

“…Sacrificial templating method can convert solid-state nanomaterials into heterostructure that may inherit the chemical composition, size, shape, and pore structure from templates, [89] thereby creating intriguing heterostructures that can hardly be prepared by wet chemistry. [90] To date, existing templates include metal oxides, [91,92] metal hydroxides, [67,93] metal sulfide, [94,95] MOFs, [83,[96][97][98] carbon materials, [99] polyoxometallate, [100,101] etc., as discussed in the following.…”

Ultrasensitive and Exclusive Chemiresistors with a ZIF-67-Derived Oxide Cage/Nanofiber Co3O4/In2O3 Heterostructure for Acetone Detection

“…To date, various chemiresistive gas sensors, including metal oxide semiconductors (MOSs), ,,, metal dichalcogenides, , transition metal carbides or carbonitrides (Mxenes), , and carbonaceous materials, have attracted considerable attention. Among them, MOSs, such as In 2 O 3 , ,, ZnO, ,, SnO 2 , , WO 3 , CeO 2 , , Co 3 O 4 , and CuO, owing to their low cost, fast response time, simple fabrication, excellent stability, and rich active sites, have been widely used for detecting VOCs. In 2 O 3 , a typical n-type semiconductor with a wide band gap of 2.6 eV, has good electrical and chemical stability.…”