Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO2toward a Superior Chemical Sensor.
Rational design of nanostructures and efficient catalyst functionalization methods are critical to the realization of highly sensitive gas sensors. In order to solve these issues, two types of strategies are reported, i.e., (i) synthesis of peapod-like hollow SnO2nanostructures (hollow 0D-1D SnO2) by using fluid dynamics of liquid Sn metal and (ii) metal-protein chelate driven uniform catalyst functionalization. The hollow 0D-1D SnO2nanostructures have advantages in enhanced gas accessibility and higher surface areas. In addition to structural benefits, protein encapsulated catalytic nanoparticles result in the uniform catalyst functionalization on both hollow SnO2spheres and SnO2nanotubes due to their dynamic migration properties. The migration of catalysts with liquid Sn metal is induced by selective location of catalysts around Sn. On the basis of these structural and uniform functionalization of catalyst benefits, biomarker chemical sensors are developed, which deliver highly selective detection capability toward acetone and toluene, respectively. Pt or Pd loaded multidimensional SnO2nanostructures exhibit outstanding acetone (Rair/Rgas= 93.55 @ 350 °C, 5 ppm) and toluene (Rair/Rgas= 9.25 @ 350 °C, 5 ppm) sensing properties, respectively. These results demonstrate that unique nanostructuring and novel catalyst loading method enable sensors to selectively detect biomarkers for exhaled breath sensors.
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, South Korea.
Ji-Soo
JS
Jang
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, South Korea.
Sunmoon
S
Yu
Applied Science Research Institute, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, South Korea.
Seon-Jin
SJ
Choi
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, South Korea.
Sang-Joon
SJ
Kim
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, South Korea.
Won-Tae
WT
Koo
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, South Korea.
Il-Doo
ID
Kim
D002384:Catalysis; D002614:Chelating Agents / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry / Q000648:ultrastructure; D054118:Nanospheres / Q000737:chemistry / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation*; D010984:Platinum / Q000737:chemistry; D011205:Povidone / Q000737:chemistry; D017971:Tin Compounds / Q000737:chemistry*
D002614:Chelating Agents; D008670:Metals; D017971:Tin Compounds; D010984:Platinum; D011205:Povidone; C045358:stannic oxide
biomarkers; carbon nanofibers; catalyst migration; chelate; chemical sensors; multidimensional hollow nanostructures