The effect of Pd on the H 2 and VOC sensing properties of TiO 2 nanorods

Şennik, Erdem; Alev, Onur; Öztürk, Zafer Ziya

doi:10.1016/j.snb.2016.01.089

Cited by 78 publications

(44 citation statements)

References 54 publications

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“…This can be explained based on an enhanced rate of catalytic activity of Pd/ZnO NW by increasing Pd content. [10,12,14] However at higher content of Pd in a Pd/ZnO NW, the catalytic activity is much pronounced which gives higher concentration of catalytic centers and lowers the saturation rate of the response and recovery process. [10,12,14] The lowest detection limit (LDL) for H 2 detection of a nanosensor based on Pd/ZnO NW (0.75 mM of PdCl 2 ) was approximated by linear fitting from Figure S13b Information, with response criteria I gas /I air > 1.2 and showed sub-ppm value beyond 0.015 ppm.…”

Section: Comments On the Functionalized Surface Models Can Be Found Imentioning

confidence: 99%

“…[10,12,14] However at higher content of Pd in a Pd/ZnO NW, the catalytic activity is much pronounced which gives higher concentration of catalytic centers and lowers the saturation rate of the response and recovery process. [10,12,14] The lowest detection limit (LDL) for H 2 detection of a nanosensor based on Pd/ZnO NW (0.75 mM of PdCl 2 ) was approximated by linear fitting from Figure S13b Information, with response criteria I gas /I air > 1.2 and showed sub-ppm value beyond 0.015 ppm. This value is lower than that for previously reported sensors on Fe-doped ZnO [22] or Zn-doped CuO and Cu 2 O nanostructured films, [6,32] Pd coated Si NWs, [33] single TeO 2 NW.…”

Section: Comments On the Functionalized Surface Models Can Be Found Imentioning

confidence: 99%

“…[34] This finding demonstrates that our optimized Pd/ZnO NW sensor possesses one of the lowest detection limits among oxide-based hydrogen sensors. [10,22,33,34] Also, the detection limit is much lower than that reported for most of the commercial hydrogen gas sensors for industrial, environmental, and military monitoring. [33] This outstanding performance could be based on the very high surface-to-volume ratio of the NWs and the high catalytic activity of Pd.…”

Section: Comments On the Functionalized Surface Models Can Be Found Imentioning

confidence: 99%

“…[9] Among all noble metals, Pddoping/incorporation has been demonstrated to show the highest efficiency in the detection of H 2 gas. [2,5,10] Such radically improved performances can be attributed to both chemical and electronic sensitizations. [5] The presence of Pd nanoparticles on ZnO greatly improves the room temperature catalytic activity due to the high H 2 solubility in Pd which gives higher concentration of clusters (catalytic centers) and lowers the saturation rate of response and recovery processes.…”

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confidence: 99%

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Functionalized Pd/ZnO Nanowires for Nanosensors

Lupan

Postica

Adelung

et al. 2017

Physica Rapid Research Ltrs

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A method for surface doping and functionalization of ZnO nanowires (NWs) with Pd (Pd/ZnO) in a one-step process is presented. The main advantage of this method is to combine the simultaneous growth, surface doping, and functionalization of NWs by using electrochemical deposition (ECD) at relatively low temperatures (90 C). Our approach essentially reduces the number of technological steps of nanomaterial synthesis and final nanodevices fabrication with enhanced performances. A series of nanosensor devices is fabricated based on single Pd/ZnO NWs with a radius of about 80 nm using a FIB/SEM system. The influence of Pd nominal composition in Pd/ZnO NW on the H 2 sensing response is studied in detail and a corresponding mechanism is proposed. The results demonstrate an ultra-high response and selectivity of the synthesized nanosensors to hydrogen gas at room temperature. The optimal concentration of PdCl 2 in the electrolyte to achieve extremely sensitive nanodevices with a gas response (S H2 ) % 1.3 Â 10 4 (at 100 ppm H 2 concentration) and relatively high rapidity is 0.75 mM. Theoretical calculations on Pd/ZnO bulk and functionalized surface further validated the experimental hypothesis. Our results demonstrate the importance of noble metal presence on the surface due to doping and functionalization of nanostructures in the fabrication of highly-sensitive and selective gas nanosensors operating at room temperature with reduced power consumption.

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Section: Comments On the Functionalized Surface Models Can Be Found Imentioning

confidence: 99%

Section: Comments On the Functionalized Surface Models Can Be Found Imentioning

confidence: 99%

Section: Comments On the Functionalized Surface Models Can Be Found Imentioning

confidence: 99%

mentioning

confidence: 99%

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Functionalized Pd/ZnO Nanowires for Nanosensors

Lupan

Postica

Adelung

et al. 2017

Physica Rapid Research Ltrs

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“…Therefore, there is a need to develop high-performance gas sensors with high sensitivity, low operating temperature and good stability for real-time monitoring of toluene and xylene. A variety of metal oxide semiconductors have been used as sensing materials to detect VOCs, such as ZnO, [4][5][6] SnO2, [7][8][9] In2O3, [10][11][12] Co3O4, [13][14][15] TiO2, 16,17 WO3, [18][19][20][21] Fe2O3, [22][23][24] Cu2O/CuO, 25,26 and NiO. 27 Among these metal oxide semiconductors, Co3O4 is believed to be a promising candidate for sensing of toluene and xylene because of its excellent catalytic activity for oxidizing them at low temperature which results from its larger adsorption amount of oxygen 28 on the surface than others and multivalent properties facilitating redox reactions.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

et al. 2017

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The development of highly active, sensitive and durable gas sensing materials for the detection of volatile organic compounds (VOCs) is extremely desirable in gas sensors. Herein, a series of mesoporous hierarchical Co3O4-TiO2 p-n heterojunctions have been prepared for the first time via the facile thermal conversion of hierarchical CoTi layered double hydroxides (CoTi-LDH) precursors at 300-400 ºC. The resulting Co3O4-TiO2 nanocomposites showed superior sensing performance towards toluene and xylene in comparison with Co3O4 and TiO2 at low temperature, and the sample with a Co/Ti molar ratio of 4 shows optimal response (Rg/Ra = 113, Rg and Ra denote the sensor resistance in a target gas and in air, respectively) to 50 ppm xylene at 115 ºC. The ultrahigh sensing activity of theses Co3O4-TiO2 p-n heterojunctions originates from their hierarchical structure, high specific surface area (>120 m 2 g −1 ), and the formation of numerous p-n heterojunctions, which results in full exposure of active sites, easy adsorption of oxygen and target gases, and large modulation of resistance. Importantly, hierarchical Co3O4-TiO2 heterojunctions possess advantages of simple preparation, structural stability, good selectivity and long-term durability. Therefore, this work provides a facile approach for the preparation of hierarchical Co3O4-TiO2 p-n heterojunctions with excellent activity, sensitivity and durability, which can be used as a promising material for the development of high-performance gas sensors.

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Application of Photocatalytic Materials in Sensors

Sun

Wang

et al. 2020

Adv Materials Technologies

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Photocatalysis technology can not only decompose water, toxic and harmful substances in the environment, but also directly convert solar energy into electricity and other clean energy. Therefore, the application of photocatalytic materials in sensors has great potential. The purpose of this paper is to review and discuss the application and potential of photocatalytic materials in sensors. The content includes the application of various photocatalytic materials in sensors. The photocatalytic materials mainly include n‐type semiconductor materials TiO2, ZnO, SnO2, Fe2O3, WO3, In2O3 and nonmetallic semiconductor C3N4. Sensors include gas sensors, photoelectrochemical sensors, electrochemical sensors, photocatalytic sensors, and other sensors. The results show that photocatalytic materials are most widely used in gas sensors. In addition to using photocatalytic materials to detect gas, the most common method is to use photocatalytic materials to detect the concentration of metal ions and organic substances in water. The most widely used photocatalytic material is titanium dioxide, and C3N4 as a nonmetallic semiconductor is rarely used in sensors. It can be concluded that photocatalytic materials have great potential in the application of sensors, among which C3N4 as a nonmetallic semiconductor photocatalytic material has more potential.

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The effect of Pd on the H 2 and VOC sensing properties of TiO 2 nanorods

Cited by 78 publications

References 54 publications

Functionalized Pd/ZnO Nanowires for Nanosensors

Functionalized Pd/ZnO Nanowires for Nanosensors

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

Application of Photocatalytic Materials in Sensors

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The effect of Pd on the H 2 and VOC sensing properties of TiO 2 nanorods

Cited by 78 publications

References 54 publications

Functionalized Pd/ZnO Nanowires for Nanosensors

Functionalized Pd/ZnO Nanowires for Nanosensors

Facile synthesis of mesoporous hierarchical Co3O4–TiO2 p–n heterojunctions with greatly enhanced gas sensing performance

Application of Photocatalytic Materials in Sensors

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Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance