Catalyst-decorated hollow WO 3 nanotubes using layer-by-layer self-assembly on polymeric nanofiber templates and their application in exhaled breath sensor

Koo, Won‐Tae; Choi, Seon‐Jin; Kim, Nam Hoon; Jang, Ji‐Soo; Kim, Il‐Doo

doi:10.1016/j.snb.2015.09.095

Cited by 110 publications

(52 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To investigate the precise oxidative state of catalysts, we carried out X‐ray photoelectron spectroscopy (XPS) analysis (Figure f and Figure S8, Supporting Information). As shown in Pt 4f spectrum in Figure f, the main peaks at 72.4 and 75.7 eV are corresponding to Pt 2+ , with spin–orbit coupling energy of 3.3 eV . Other smaller peaks correspond to Pt at 71.2 eV for 4f 7/2 .…”

Section: Resultsmentioning

confidence: 80%

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO₂toward a Superior Chemical Sensor

Jang

Choi

et al. 2016

Small

Self Cite

View full text Add to dashboard Cite

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 SnO nanostructures (hollow 0D-1D SnO ) by using fluid dynamics of liquid Sn metal and (ii) metal-protein chelate driven uniform catalyst functionalization. The hollow 0D-1D SnO nanostructures 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 SnO spheres and SnO nanotubes 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 SnO nanostructures exhibit outstanding acetone (R /R = 93.55 @ 350 °C, 5 ppm) and toluene (R /R = 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.

show abstract

Section: Resultsmentioning

confidence: 80%

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO₂toward a Superior Chemical Sensor

Jang

Choi

et al. 2016

Small

Self Cite

View full text Add to dashboard Cite

show abstract

“…WO 3 NFs/NTs functionalized by Pt [168,187], Pd [107,188], Cu [101], Ru [189], Rh 2 O 3 [106], Au NPs [109], RuO 2 NPs [189], La 2 O 3 [104] as well as Pd-loaded ZnO nanocubes [1] have been extensively applied for sensing of acetone, ethanol, toluene, formaldehyde and volatile organic compounds (VOCs). WO 3 NFs functionalized by Au NPs exhibit improved VOC sensing properties.…”

Section: Reviewmentioning

confidence: 99%

Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials

Muhammad¹,

Motta²,

Shafiei³

2018

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

Electrospun one-dimensional (1D) nanostructures are rapidly emerging as key enabling components in gas sensing due to their unique electrical, optical, magnetic, thermal, mechanical and chemical properties. 1D nanostructures have found applications in numerous areas, including healthcare, energy storage, biotechnology, environmental monitoring, and defence/security. Their enhanced specific surface area, superior mechanical properties, nanoporosity and improved surface characteristics (in particular, uniformity and stability) have made them important active materials for gas sensing applications. Such highly sensitive and selective elements can be embedded in sensor nodes for internet-of-things applications or in mobile systems for continuous monitoring of air pollutants and greenhouse gases as well as for monitoring the well-being and health in everyday life. Herein, we review recent developments of gas sensors based on electrospun 1D nanostructures in different sensing platforms, including optical, conductometric and acoustic resonators. After explaining the principle of electrospinning, we classify sensors based on the type of materials used as an active sensing layer, including polymers, metal oxide semiconductors, graphene, and their composites or their functionalized forms. The material properties of these electrospun fibers and their sensing performance toward different analytes are explained in detail and correlated to the benefits and limitations for every approach.

show abstract

“…Often a precursor functional group is required to improve adhesion or bonding between the template and the first layer. However, strongly ionic polymers such as PDDA can be used to establish a favorable charged surface to promote further electrostatic bonding without any precursor functionalization [334]. In a similar group of strongly cationic polymers, poly(allylamine hydrochloride) (PAH) and poly(ethyleneimine) (PEI) are also frequently used to alternate with an appropriate anionic polymer such as PSS or poly(acrylic acid) (PAA).…”

Section: Layer-by-layer Depositionmentioning

confidence: 99%

“…Nanotubes of indium-tin-oxide (ITO) [338] Au [339], CdTe [339], TiO 2 [340], Pt/CeO 2 [341], WO 3 [334], and Y 2 O 3 / Yb/Er [342] have been produced using this method. For the formation of hollow nanoparticles, PS nanoparticles as seen with templating hollow MSNs, are also used in conjunction with LbL to produce hollow nanoparticles of titania, silica, or laponite (synthetic clay [Na 0.7 (Si 8 Mg 5.5 Li 0.3 )O 20 (OH) 4 ]) with PDDA/PAH/PSS polyelectrolytes used as the alternating layers [343].…”

Section: Layer-by-layer Depositionmentioning

confidence: 99%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

129

View full text Add to dashboard Cite

A variety of nanostructured materials are produced through template-based synthesis methods, including zerodimensional, one-dimensional, and two-dimensional structures. These span different forms such as nanoparticles, nanowires, nanotubes, nanoflakes, and nanosheets. Many physical characteristics of these materials such as the shape and size can be finely controlled through template selection and as a result, their properties as well. Reviewed here are several examples of these nanomaterials, with emphasis specifically on the templates and synthesis routes used to produce the final nanostructures. In the first section, the templates have been discussed while in the second section, their corresponding synthesis methods have been briefly reviewed, and lastly in the third section, applications of the materials themselves are highlighted. Some examples of the templates frequently encountered are organic structure directing agents, surfactants, polymers, carbon frameworks, colloidal sol-gels, inorganic frameworks, and nanoporous membranes. Synthesis methods that adopt these templates include emulsion-based routes and template-filling approaches, such as self-assembly, electrodeposition, electroless deposition, vapor deposition, and other methods including layer-by-layer and lithography. Templatebased synthesized nanomaterials are frequently encountered in select fields such as solar energy, thermoelectric materials, catalysis, biomedical applications, and magnetowetting of surfaces.

show abstract

Catalyst-decorated hollow WO 3 nanotubes using layer-by-layer self-assembly on polymeric nanofiber templates and their application in exhaled breath sensor

Cited by 110 publications

References 58 publications

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO₂toward a Superior Chemical Sensor

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO₂toward a Superior Chemical Sensor

Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials

Template-based syntheses for shape controlled nanostructures

Contact Info

Product

Resources

About

Catalyst-decorated hollow WO 3 nanotubes using layer-by-layer self-assembly on polymeric nanofiber templates and their application in exhaled breath sensor

Cited by 110 publications

References 58 publications

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO2toward a Superior Chemical Sensor

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO2toward a Superior Chemical Sensor

Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials

Template-based syntheses for shape controlled nanostructures

Contact Info

Product

Resources

About

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO₂toward a Superior Chemical Sensor

Metal Chelation Assisted In Situ Migration and Functionalization of Catalysts on Peapod-Like Hollow SnO₂toward a Superior Chemical Sensor