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Perovskite La0.75Sr0.25Cr0.5Mn0.5O3−δ sensitized SnO2 fiber-in-tube scaffold: highly selective and sensitive formaldehyde sensing†
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2018-04-30 00:00:00 , DOI: 10.1039/c8ta02725k Joon-Young Kang 1, 2, 3, 4 , Ji-Soo Jang 1, 2, 3, 4 , Won-Tae Koo 1, 2, 3, 4 , Jongsu Seo 1, 2, 3, 4 , Yoonseok Choi 1, 2, 3, 4 , Min-Hyeok Kim 1, 2, 3, 4 , Dong-Ha Kim 1, 2, 3, 4 , Hee-Jin Cho 1, 2, 3, 4 , WooChul Jung 1, 2, 3, 4 , Il-Doo Kim 1, 2, 3, 4
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2018-04-30 00:00:00 , DOI: 10.1039/c8ta02725k Joon-Young Kang 1, 2, 3, 4 , Ji-Soo Jang 1, 2, 3, 4 , Won-Tae Koo 1, 2, 3, 4 , Jongsu Seo 1, 2, 3, 4 , Yoonseok Choi 1, 2, 3, 4 , Min-Hyeok Kim 1, 2, 3, 4 , Dong-Ha Kim 1, 2, 3, 4 , Hee-Jin Cho 1, 2, 3, 4 , WooChul Jung 1, 2, 3, 4 , Il-Doo Kim 1, 2, 3, 4
Affiliation
In this work, highly porous SnO2 fiber-in-tubes (FITs), which are functionalized with perovskite La0.75Sr0.25Cr0.5Mn0.5O3−δ (LSCM) particles as a chemical sensitizer, are used as a superior formaldehyde (CH2O) sensing layer. LSCM-loaded as-spun Sn precursor/polymer composite fibers are rapidly calcined to create a porous FIT SnO2 structure with high surface area. Such unique morphological evolution originates from the Ostwald ripening effect and crystal growth inhibition caused by LSCM particles. Furthermore, LSCM particles with high oxygen vacancy concentration and a large work function significantly promote oxygen spillover and electron depletion on the surface of SnO2 (6.80 eV for LSCM vs. 4.55 eV for SnO2). As a result, LSCM-loaded SnO2 FITs (LSCM@SnO2 FITs) provide remarkably high response to formaldehyde (Rair/Rgas = 26.50 to 5 ppm) and excellent selectivity against interfering gases (H2S, C7H8, NH3, C2H6O, C8H10, CO, and C5H12) even without using noble metal catalysts. These observations demonstrate the potential use of LSCM@SnO2 FITs for real-time monitoring of indoor air quality, especially toward formaldehyde, which has not been accurately detected by using conventional metal oxide based sensors.
中文翻译:
钙钛矿La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3− δ敏化的SnO 2管内纤维支架:高选择性和灵敏的甲醛感测†
在这项工作中,高度多孔的SnO 2的纤维中的管中(痉挛),其官能化钙钛矿的La 0.75锶0.25铬0.5锰0.5 ø 3- δ(LSCM)粒子作为化学敏化剂,被用作优良的甲醛( CH 2 O)感应层。将负载LSCM的初生Sn前驱体/聚合物复合纤维快速煅烧以生成多孔FIT SnO 2高表面积的结构。这种独特的形态演化源自于LSCM颗粒引起的奥斯特瓦尔德(Ostwald)成熟效应和晶体生长抑制作用。此外,具有高的氧空位浓度和大的功函数的LSCM颗粒显著促进氧外溢和电子耗尽SnO的表面上2(6.80电子伏特为LSCM与4.55电子伏特为的SnO 2)。结果,负载LSCM的SnO 2 FIT(LSCM @ SnO 2 FIT)对甲醛的响应非常高(R空气/ R气体= 26.50至5 ppm),并且对干扰气体(H 2 S,C 7 H )具有出色的选择性如图8所示,即使不使用贵金属催化剂,NH 3,C 2 H 6 O,C 8 H 10,CO和C 5 H 12)。这些观察结果表明,LSCM @ SnO 2 FIT可能用于实时监测室内空气质量,尤其是对甲醛的监测,而使用传统的基于金属氧化物的传感器无法准确检测到甲醛。
更新日期:2018-04-30
中文翻译:
钙钛矿La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3− δ敏化的SnO 2管内纤维支架:高选择性和灵敏的甲醛感测†
在这项工作中,高度多孔的SnO 2的纤维中的管中(痉挛),其官能化钙钛矿的La 0.75锶0.25铬0.5锰0.5 ø 3- δ(LSCM)粒子作为化学敏化剂,被用作优良的甲醛( CH 2 O)感应层。将负载LSCM的初生Sn前驱体/聚合物复合纤维快速煅烧以生成多孔FIT SnO 2高表面积的结构。这种独特的形态演化源自于LSCM颗粒引起的奥斯特瓦尔德(Ostwald)成熟效应和晶体生长抑制作用。此外,具有高的氧空位浓度和大的功函数的LSCM颗粒显著促进氧外溢和电子耗尽SnO的表面上2(6.80电子伏特为LSCM与4.55电子伏特为的SnO 2)。结果,负载LSCM的SnO 2 FIT(LSCM @ SnO 2 FIT)对甲醛的响应非常高(R空气/ R气体= 26.50至5 ppm),并且对干扰气体(H 2 S,C 7 H )具有出色的选择性如图8所示,即使不使用贵金属催化剂,NH 3,C 2 H 6 O,C 8 H 10,CO和C 5 H 12)。这些观察结果表明,LSCM @ SnO 2 FIT可能用于实时监测室内空气质量,尤其是对甲醛的监测,而使用传统的基于金属氧化物的传感器无法准确检测到甲醛。