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Materials Research Express · 2019 ·Vol. 6 ·期 11 ·115084 · IF 1.449

Instability and protection of monolayer WS2 under heating and corona discharge conditions

Feng Huang,Yanfei Lv,Siwei Zhang,Guodan Wei,Shichao Zhao

Monolayer Tungsten disulfide (WS2) shows unique optoelectronic properties and has potential applications in nanodevices. However, the stability of the monolayer WS2 exposed in the ambient condition should be evaluated and improved before its practical application. In this paper, we investigated the shape, structure, and luminescence of the monolayer WS2 under heating and corona discharge conditions in air. We show that monolayer WS2 without any coating film is unstable under such practical condition. To protect the monolayer, we covered a layer of polymethyl methacrylate (PMMA) on the surface of the monolayer WS2 and found the stability was improved.

CAS / MDL: 12138-09-9

研究领域: 材料科学 · 物理化学

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FOOD CHEMISTRY · 2024 · IF 8.5

Rapid evaluation of vegetable oil varieties and geographical origins by ambient corona discharge ionization mass spectrometry

Pinghua Hu,Wenwen Yang,Jun Zhang,Zhendong Yu,Xinglei Zhang,Konstantin Chingin,Huanwen Chen,Xiaoping Zhang

The composition and ratio of unsaturated fatty acids in vegetable oils play a crucial role in determining their overall quality. In this study, we present a corona discharge ionization mass spectrometry (MS) method for the rapid differentiation of vegetable oil varieties and their geographical origins under environmental conditions. Abundant water dimer radical cations, (H 2 O) 2 +• , were generated by the ionization setup, which effectively activated carbon‑carbon double bonds (C=C) to form epoxidized products. These epoxidation products were analyzed using tandem MS, generating diagnostic fragment ions that precisely identified C C bond positions. Statistical analysis models were subsequently developed using the resulting MS fingerprint data, revealing significant differences between various vegetable oils and olive oils from different origins. Key advantages of this method include minimal sample preparation, rapid analysis, and easily interpretable spectra. This study provides a new MS-based strategy for food quality assessment and offers a promising tool for identifying C C positional isomers in complex systems.

CAS / MDL: 60-33-3 463-40-1 112-80-1

研究领域: 食品科学 · 分析化学

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Instability and protection of monolayer WS2 under heating and corona discharge conditions

Rapid evaluation of vegetable oil varieties and geographical origins by ambient corona discharge ionization mass spectrometry