WO<sub>3</sub>
 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Choi, Seon‐Jin; Kim, Sang-Joon; Cho, Hee Jin; Jang, Ji‐Soo; Lin, Yi-Min; Tuller, Harry L.; Rutledge, Gregory C.; Kim, Il‐Doo

doi:10.1002/smll.201502905

Cited by 81 publications

(55 citation statements)

References 49 publications

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“…Precious metal loaded mesoporous WO 3 materials have been reported by using the complicated hard templating synthesis of mesoporous WO 3 followed by loading noble metal via impregnation . Precious metal ions embedded in protein nanocages or metal−organic framework were prepared for electrospinning and calcination to synthesize SMO nanofibers with immobilized metal nanoparticles (e.g., Au, Pt, and Pd), which improved the dispersity of noble metal nanoparticles in SMO . However, these methods involve a multistep synthesis with poor controllability in terms of the porosity and pore accessibility, positioning metal nanoparticles and so on.…”

Section: Introductionmentioning

confidence: 99%

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Ren

Zhou

et al. 2017

Adv Funct Materials

250

179

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In this study, a straightforward coassembly strategy is demonstrated to synthesize Pt sensitized mesoporous WO 3 with crystalline framework through the simultaneous coassembly of amphiphilic poly(ethylene oxide)-b-polystyrene, hydrophobic platinum precursors, and hydrophilic tungsten precursors. The obtained WO 3 /Pt nanocomposites possess large pore size (≈13 nm), high surface area (128 m 2 g −1 ), large pore volume (0.32 cm 3 g −1 ), and Pt nanoparticles (≈4 nm) in situ homogeneously distributed in mesopores, and they exhibit excellent catalytic sensing response to CO of low concentration at low working temperature with good sensitivity, ultrashort response-recovery time (16 s/1 s), and high selectivity. In-depth study reveals that besides the contribution from the fast diffusion of gaseous molecules and rich interfaces in mesoporous WO 3 /Pt nanocomposites, the partially oxidized Pt nanoparticles that chemically and electronically sensitize the crystalline WO 3 matrix, dramatically enhance the sensitivity and selectivity.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201705268. metal oxides (SMOs), such as WO 3 , [1] ZnO, [2] SnO 2 , [3] In 2 O 3 , [4] have attracted much attention for their wide applications in monitoring gas leakage, air quality, food safety, and medical diagnosis, [5][6][7][8][9] owing to their excellent properties including easy production, low-cost, long-term stability, and compact size. [10] A fast responserecovery dynamics, high sensitivity, and high selectivity are indispensable to highperformance gas sensors based on SMOs because some toxic and flammable gases (e.g., carbon monoxide), are colorless, odorless and tasteless, and extremely poisonous even at low concentrations. Considering that the gas-sensing process strongly relies on surface reactions between target gases and surface-chemisorbed oxygen species on the sensing layers, rational and controlled synthesis of nanomaterials with high surface areas, tailor-designed structure [11][12][13][14] combined with effective catalytic sensitization [15,16] is a promising approach to develop high-performance sensing sensors.SMO nanomaterials with mesoporous structures are promising candidates for gas sensing nanodevices due to their high specific surface area, highly depleted region in thin pore walls, and highly interconnected and adjustable ordered mesopores. [11,12] The high surface area favors the interaction between gas molecules and the solid porous oxide wall as well as the surface catalytic reaction. Moreover, the well-connected channels and a mesoscale (2−50 nm) pore size are advantageous to gas diffusion due to the facile penetration of gas molecules dominated by Knudsen diffusion. [12] To date, mesoporous SMOs can be synthesized through template-free method or templating method. The former includes sol-gel synthesis procedure, [17] spray pyrolysis, [18] and chemical vapor deposition, [3b] which usually lead to materials with ill-defined porous structur...

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Section: Introductionmentioning

confidence: 99%

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Ren

Zhou

et al. 2017

Adv Funct Materials

250

179

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“…NO 2 Sensing Characterization : Temperature‐controlled NO 2 adsorption and desorption characteristics were evaluated using a homemade measurement setup . The resistance changes of the porous Ru oxide NSs were measured during the cyclic exposure to NO 2 using a data acquisition system (34972A, Agilent) with a 16‐channel multiplexer (34902A, Agilent).…”

Section: Methodsmentioning

confidence: 99%

Optically Sintered 2D RuO₂ Nanosheets: Temperature‐Controlled NO₂ Reaction

Choi

Jang

Park

et al. 2017

Adv Funct Materials

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examples include transition metal dichalcogenides (MoS 2 , MoSe 2 , WS 2 , WSe 2 , etc.), [6] metal oxide (Ti oxides, Mn oxides, Ru oxides, etc.), [7][8][9] and layered double hydroxides. [9] In particular, 2D metal oxides NSs such as Ti oxides, [10,11] Mn oxide, [12,13] and Ru oxides [14] have been intensively studied for applications in dielectric nanodevices and electrochemical energy storage by facilitating metallic and semiconducting properties. One of the most promising metal oxide NSs is monolayer Ru oxide exhibiting a highly conductive property. In-depth studies have been performed to establish a synthesis method and investigate the material properties of Ru oxide NSs. Particularly, considerable progress has been made using Ru oxide NSs as an effective catalyst for electrochemical supercapacitors, oxygen reduction electrocatalysts, and photocatalysts. [15][16][17][18] Very interesting features of metal oxide NSs triggered extensive research; however, the applications of the layered metal oxides are mainly in energy conversion and storage systems. For this reason, exploration and discovery of new applications are imperative to expand the versatility of metal oxide NSs in many research fields.Recently, the detection of chemical species using wearable sensors has gained much interest due to the need of real-time and on-site monitoring of environmental and physical conditions. [19][20][21] Nanostructured metal oxides using 0D nanoparticles and 1D nanofibers have been widely studied for highly sensitive chemical sensors. [22][23][24][25] However, the inherently brittle property of metal oxides limits further application as sensing layers in wearable platform. As an emerging sensing structure, 2D-layered NSs are the most suitable candidate for wearable chemical sensors due to their mechanical flexibility as well as large surface reaction sites. Thus far, atomically thin 2D graphene and transition metal dichalcogenides (TMD) layers have been mainly investigated for chemical sensors. [26][27][28][29][30][31][32] Late et al. evaluated chemical sensing characteristics using a thin-layered MoS 2 transistor, which revealed high NO 2 sensitivity with five-layer MoS 2 . [33] In addition, the 2D hybrid structure of MoS 2 /graphene layers was proposed by Cho et al. [35] and Long et al. [34] for the detection of NO 2 molecules. In particular, Cho et al. demonstrated flexible NO 2 sensors by integration of the 2D hybrid MoS 2 /graphene layers on a yellow polyimide film. [35] Although numerous efforts have been made to investigate the chemical sensing characteristics of graphene and TMD layers, the chemical sensing property of atomically 2D Ru oxide nanosheets (NSs) with optically punched nanoholes are synthesized and integrated on a flexible heating substrate, i.e., silver nanowire (Ag NW)-embedded colorless polyimide (cPI) film, for application in wearable chemical sensors. Multiple discrete pores on the sub-5-nm scale are formed on the basal planes of Ru oxide NSs by irradiation of intense pulsed light. The chemical sens...

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“…(Figure c). The novel catalyst synthetic route is extended to form porous 1D WO 3 NFs with uniformly decorated catalysts on the surface . As shown in Figure d, apoferritin‐encapsulated NPs are self‐assembled on polystyrene (PS) colloids by attractive electrostatic interactions.…”

Section: Chemiresistive Type Sensorsmentioning

confidence: 99%

Electrospun Nanostructures for High Performance Chemiresistive and Optical Sensors

Choi

Persano

Camposeo

et al. 2017

Macro Materials & Eng

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Chemical sensors have been essential components in recent years due to the gathering attention in environmental monitoring and healthcare. In this review, the authors comprehensively highlight recent progresses on the 1D chemiresistive-type sensors based on semiconductor metal oxides (SMOs) and optical-type sensors, which are prepared by electrospinning technique. In the part of chemiresistive-type sensors, diverse synthesis techniques for 1D SMO nanofibrous structure are presented with controlled microstructure and surface morphology. In addition, unique functionalization routes of emerging nanocatalysts encapsulated by bio-inspired templates are described for the next generation catalyst on the 1D SMO nanofibers (NFs). For the optical-type sensors, new classes of 1D NFs employing specific absorption and emission properties are introduced. In particular, diverse 1D NF-based colorimetric and fluorescence sensors as well as Raman and surface-enhanced Raman scattering sensors are covered in the view point of material preparation and optical sensing properties. Finally, the authors prospect future research directions to overcome current limitations and challenges to achieve high performance chemical sensors.

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WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Cited by 81 publications

References 49 publications

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Optically Sintered 2D RuO₂ Nanosheets: Temperature‐Controlled NO₂ Reaction

Electrospun Nanostructures for High Performance Chemiresistive and Optical Sensors

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WO3 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Cited by 81 publications

References 49 publications

Pt Nanoparticles Sensitized Ordered Mesoporous WO3 Semiconductor: Gas Sensing Performance and Mechanism Study

Pt Nanoparticles Sensitized Ordered Mesoporous WO3 Semiconductor: Gas Sensing Performance and Mechanism Study

Optically Sintered 2D RuO2 Nanosheets: Temperature‐Controlled NO2 Reaction

Electrospun Nanostructures for High Performance Chemiresistive and Optical Sensors

Contact Info

Product

Resources

About

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Pt Nanoparticles Sensitized Ordered Mesoporous WO₃ Semiconductor: Gas Sensing Performance and Mechanism Study

Optically Sintered 2D RuO₂ Nanosheets: Temperature‐Controlled NO₂ Reaction