Branched tellurium hollow nanofibers by galvanic displacement reaction and their sensing performance toward nitrogen dioxide

Park, Hosik; Jung, Hyunsung; Zhang, Miluo; Chang, Chong Hyun; Ndifor-Angwafor, Nche George; Choa, Yong‐Ho; Myung, Nosang V.

doi:10.1039/c3nr00060e

Cited by 36 publications

(30 citation statements)

References 51 publications

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“…Tellurium (Te) is another kind of material that can be used as active element in gas sensors operated at room temperature. Te can detect a variety of gases including NH 3 , H 2 S, CO, and NO 2 . In early reports, Te‐based thin films fabricated by thermal evaporation or RF sputtering have been investigated for room‐temperature gas sensors.…”

Section: Materials For Gas Sensing21single‐element Materialsmentioning

confidence: 99%

“…Recently, tube‐like structures of Te have been used as room‐temperature sensor materials due to their 1D structure, large surface‐to‐volume ratio and less agglomerated configuration. Because of their well‐adapted morphology, Te nanotubes demonstrate quite interesting sensing performance in terms of sensitivity, detection limit and response‐recovery times in comparison to their thin film counterparts.…”

Section: Materials For Gas Sensing21single‐element Materialsmentioning

confidence: 99%

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Nanostructured Materials for Room‐Temperature Gas Sensors

et al. 2015

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Sensor technology has an important effect on many aspects in our society, and has gained much progress, propelled by the development of nanoscience and nanotechnology. Current research efforts are directed toward developing high-performance gas sensors with low operating temperature at low fabrication costs. A gas sensor working at room temperature is very appealing as it provides very low power consumption and does not require a heater for high-temperature operation, and hence simplifies the fabrication of sensor devices and reduces the operating cost. Nanostructured materials are at the core of the development of any room-temperature sensing platform. The most important advances with regard to fundamental research, sensing mechanisms, and application of nanostructured materials for room-temperature conductometric sensor devices are reviewed here. Particular emphasis is given to the relation between the nanostructure and sensor properties in an attempt to address structure-property correlations. Finally, some future research perspectives and new challenges that the field of room-temperature sensors will have to address are also discussed.

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Section: Materials For Gas Sensing21single‐element Materialsmentioning

confidence: 99%

Section: Materials For Gas Sensing21single‐element Materialsmentioning

confidence: 99%

Nanostructured Materials for Room‐Temperature Gas Sensors

et al. 2015

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“…Tellurium (Te), due to its unique crystal structure, exhibits many unique properties, such as piezoelectric effect, photoconductivity, catalytic activity, gas sensing, and thermoelectrics (Bradstreet, 1949;Shurygin et al, 1975;Kambe et al, 1981;Fujiwara and Shin-Ike, 1992;Wang et al, 2006;Liu et al, 2010b;Zhang et al, 2012;Lee et al, 2013;Park et al, 2013). Recently, considerable attention has been also directed to tellurides, such as bismuth telluride (Bi 2 Te 3 ), lead telluride (PbTe), antimony telluride (Sb 2 Te 3 ), and cadmium telluride (CdTe), revealing remarkable performances in electronic applications (Wuttig and Yamada, 2007;LaLonde et al, 2011;Kumar and Rao, 2014;Guo et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Mechanism of Tellurium Reduction in Alkaline Medium

Kim

Myung

2020

Front. Chem.

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A systematic electrochemical study was conducted to investigate the reduction of tellurium (Te) in alkaline solutions. The effect of various parameters, including tellurite ion concentration, applied potential, and pH was investigated by both linear sweep voltammograms (LSVs) and electrochemical quartz crystal microbalance (EQCM). EQCM was essential to understand the reduction of Te(0) to soluble Te 2− 2 (-I) or Te 2− (-II). The Tafel slopes for two Te reduction reactions [i.e., Te(IV) to Te(0) and Te(0) to Te(-I)] indicated that the electrochemical reduction of Te is strongly dependent on solution pH, whereas it is independent of the concentration of TeO 2− 3. At relatively weaker alkaline solutions (i.e., pH ≤ 12.5), the discharge of Te(OH) + 3 was determined to be the rate-limiting step during the reduction of Te(IV) to Te(0). For the reduction of Te(0) to Te(-I), the reaction follows a four-step reaction, which consisted of two discharge and two electrochemical reactions. The second discharge reaction was the rate-limiting step when pH ≤12.5 with the Tafel slope of 120 mV/decade. At a higher pH of 14.7, the Tafel slope was shifted to be 40 mV/decade, which indicated that the rate-limiting step was altered to the second electrochemical reaction. Te(0) deposits were found either on the surface of an electrode or in the solution depending on pH due to the different rate-limiting reactions, revealing that pH was a key parameter to dictate the morphology of the Te(0) deposits in alkaline media.

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“…However, limited works are reported on the synthesis of metal chalcongenide nanofibers because of difficulty to prepare solutions. Therefore, synthesis of a few millimeter chalcogenide nanofibers has been realized by combining electrospinning with an additional process called the galvanic displacement reaction (Xiao et al, 2007b ; Chang et al, 2010a , b , 2014 ; Hangarter et al, 2010 ; Jung et al, 2010 , 2012 ; Park et al, 2010 , 2013 ; Rheem et al, 2010 ; Suh et al, 2012 , 2013 ; Elazem et al, 2013 ; Jeong et al, 2013 ; Liu et al, 2013 ; Wu et al, 2014 , 2015 ; Zhang et al, 2014 ), by which the electrospun nanofibers can be converted to desired hollow metal chalcogenides spontaneously. Several hollow nanofibers of chalcogens and metal chalcogenides [e.g., Te (Lee et al, 2011 ; Jeong et al, 2013 ), Ag 2 Te (Park et al, 2015 ; Zhang et al, 2015 ), and Pb x Se y Ni z (Zhang et al, 2014 )] have been successfully synthesized by this method in our group.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Thermoelectric Characterization of Lead Telluride Hollow Nanofibers

et al. 2018

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Lead telluride (PbTe) nanofibers were fabricated by galvanic displacement of electrospun cobalt nanofibers where their composition and morphology were altered by adjusting the electrolyte composition and diameter of sacrificial cobalt nanofibers. By employing Co instead of Ni as the sacrificial material, residue-free PbTe nanofibers were synthesized. The Pb content of the PbTe nanofibers was slightly affected by the Pb2+ concentration in the electrolyte, while the average outer diameter increased with Pb2+ concentration. The surface morphology of PbTe nanofibers was strongly dependent on the diameter of sacrificial nanofibers where it altered from smooth to rough surface as the Pb2+ concentration increased. Some of thermoelectric properties [i.e., thermopower (S) and electrical conductivity(σ)] were systematically measured as a function of temperature. Energy barrier height (Eb) was found to be one of the key factors affecting the thermoelectric properties–that is, higher energy barrier heights increased the Seebeck coefficient, but lowered the electrical conductivity.

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Branched tellurium hollow nanofibers by galvanic displacement reaction and their sensing performance toward nitrogen dioxide

Cited by 36 publications

References 51 publications

Nanostructured Materials for Room‐Temperature Gas Sensors

Nanostructured Materials for Room‐Temperature Gas Sensors

Electrochemical Mechanism of Tellurium Reduction in Alkaline Medium

Synthesis and Thermoelectric Characterization of Lead Telluride Hollow Nanofibers

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