TY - JOUR
T1 - Treatment-dependent surface chemistry and gas sensing behavior of the thinnest member of titanium carbide MXenes
AU - Sun, Qian
AU - Wang, Jian
AU - Wang, Xiang
AU - Dai, Jie
AU - Wang, Xiaoshan
AU - Fan, Huacheng
AU - Wang, Zhiwei
AU - Li, Hai
AU - Huang, Xiao
AU - Huang, Wei
N1 - Publisher Copyright:
© 2020 The Royal Society of Chemistry.
PY - 2020/8/28
Y1 - 2020/8/28
N2 - MXenes, a rapidly developing family of two-dimensional materials possessing tunable electronic properties and abundant surface functional groups, are promising gas-sensing materials. Ti2CTx, with a thinner unit cell thickness compared to its compositional analogue Ti3C2Tx and thus more profound surface-dependent properties, has been less explored over the past years. Herein, by etching the precursor Ti2AlC with a concentrated HF or LiF/HCl mixture, semiconducting Ti2CTx (HF) nanosheets and metallic Ti2CTx (LiF/HCl) nanosheets were obtained, respectively, arising from their treatment-dependent surface functionalization. In addition, the resulting metallic nanosheets were partially oxidized into TiO2/Ti2CTx (LiF/HCl) hybrid, which exhibited superior sensitivity toward NH3 gas as compared with Ti2CTx (HF) and Ti2CTx (LiF/HCl). Detailed analysis suggests that a high concentration of surface oxygen containing species, such as -Ox, -(OH)x and Ti-O-Ti, is generally beneficial for NH3 sensing, and a relatively higher -Ox concentration allows rapid gas desorption and sensor recovery.
AB - MXenes, a rapidly developing family of two-dimensional materials possessing tunable electronic properties and abundant surface functional groups, are promising gas-sensing materials. Ti2CTx, with a thinner unit cell thickness compared to its compositional analogue Ti3C2Tx and thus more profound surface-dependent properties, has been less explored over the past years. Herein, by etching the precursor Ti2AlC with a concentrated HF or LiF/HCl mixture, semiconducting Ti2CTx (HF) nanosheets and metallic Ti2CTx (LiF/HCl) nanosheets were obtained, respectively, arising from their treatment-dependent surface functionalization. In addition, the resulting metallic nanosheets were partially oxidized into TiO2/Ti2CTx (LiF/HCl) hybrid, which exhibited superior sensitivity toward NH3 gas as compared with Ti2CTx (HF) and Ti2CTx (LiF/HCl). Detailed analysis suggests that a high concentration of surface oxygen containing species, such as -Ox, -(OH)x and Ti-O-Ti, is generally beneficial for NH3 sensing, and a relatively higher -Ox concentration allows rapid gas desorption and sensor recovery.
UR - https://www.scopus.com/pages/publications/85089786901
U2 - 10.1039/c9nr08350b
DO - 10.1039/c9nr08350b
M3 - 文章
C2 - 32780062
AN - SCOPUS:85089786901
SN - 2040-3364
VL - 12
SP - 16987
EP - 16994
JO - Nanoscale
JF - Nanoscale
IS - 32
ER -