Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia

Alizadeh, Taher; Ahmadian, Farzaneh

doi:10.1016/j.aca.2015.09.031

Cited by 40 publications

(37 citation statements)

References 48 publications

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“…The preparation process of Pd x -Ni y /NS/CA series involves the anchoring of metal ions onto raw cotton fibers, followed by the reduction of metallic ions with thiourea via a hydrothermal (180 °C) process (Figure 2). [22] The resultant hydrogels are converted into conductive carbon fiber aerogels with a high porosity via the sublimation of water by freeze-drying. [21] Hydrothermal reaction under thiourea causes a reduction of the metal ions into nanoparticles and allows for an N and S doping of the carbon fibers.…”

Section: Results and Discusionmentioning

confidence: 99%

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

kumar

Manthiram

2019

Advanced Energy Materials

105

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as biological renewability, low toxicity, and easy storability. [5] Despite the recent improvements in DEGFCs, the technology is still hindered by the problems of conventional platinum (Pt) anode catalysts, such as surface poisoning, high cost, and scarcity. [6] Recently, palladium (Pd) nanostructures have emerged as a promising EG oxidation catalyst in alkaline media, eliminating the necessity of the Pt nanocatalyst for EG oxidation. [7] However, Pd nanocatalysts are prone to rapid deterioration under surface poisoning and instability. [8] The formation of bimetals with non-precious transition metals (PdM, M = Ni, Co, Fe, Cu, Mo, Sn, etc.) is an efficient strategy to improve the stability without sacrificing the catalytic activity. [9] The oxophilic nickel (Ni) is recognized as a naturally abundant metal with enhanced corrosion resistance. [10] The inclusion of Ni into the crystal lattice of Pd facilitates active sites for -OH adsorption (OH ads ) and weakens their interaction with reaction intermediates adsorbed onto the Pd surface. [10,11] In parallel, metal nanoparticles decorated on carbon supports have also been shown to improve EG oxidation via their high electrical conductivity and catalytic activity. [12] The 3D porous structure of carbon nanotubes (CNTs) could considerably control the aggregation or stacking of the adjacent subunits, facilitating a uniform distribution of metal nanoparticles and increasing the number of accessible reactive sites for catalytic surface reactions. [13] However, the conventional strategy used for the fabrication of metal nanoparticles anchored onto CNTs involves strenuous multistep procedures, and the acidification process involved distorts the interconnected conduction channels, which consequently limits the EG oxidation kinetics. [14] Hence, the development of catalytically active metal nanoparticles encased within the graphitic layers of CNTs is highly desirable. [15] The mass transfer capability and catalytic activity of carbon nanostructures could be further improved with the development of porosity and heteroatom doping into the carbon skeleton. [16] Recently, 3D carbon aerogels (CAs) have grasped prevailing research attention as free-standing electrodes for diverse energy applications owing to their large specific surface area, low density, interconnected fibrous structure, and rapid charge transport pathways. [17,18] In this context, Pd nanoparticles Flexible and 3D carbon aerogels (CAs) composed of carbon nanotubes (CNTs) with carbon shell-confined binary palladium-nickel (Pd x -Ni y ) nanocatalysts on carbon fibers (Pd x -Ni y /NSCNT/CA) have been developed through a facile chemical vapor deposition method. The 3D porous carbon network and the synergistic effect of carbon shell-confined bimetal nanoparticles of rationally constructed aerogels facilitate enhanced electrocatalytic and antipoisoning activities toward ethylene glycol (EG) oxidation reaction compared to the commercial Pt/C catalyst. With the 3D morphological features and direct growth of Pd-Ni bimet...

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Section: Results and Discusionmentioning

confidence: 99%

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

kumar

Manthiram

2019

Advanced Energy Materials

105

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“…Graphene is a promising candidate for the gas sensors for detecting individual gas due to its exceptionally low‐noise property, however, the graphene‐based sensors without any modification always exhibit an inferior selectivity . The chemical modification and introduction of heterostructure materials in the 3D graphene network have been proved to be efficient ways to prepare high‐performance gas sensors . For example, HSO 3 − with lone‐pair electrons was used to modify the graphene sheets, and the resultant modified graphene network showed an enhanced selectivity of NO 2 due to the weak interaction between HSO 3 − and NO 2 .…”

Section: Aerogel‐based Sensorsmentioning

confidence: 99%

“…[149] Besides the above semiconductor-based aerogels, there are some other aerogels can be used for gas sensors, such as carbon aerogels, organic aerogels, and their composite aerogels. [62,63,179,181,182,184,[190][191][192][193][194][195]197,[199][200][201][202][210][211][212][213][214] Carbon quantum dots, the carbon nanomaterials with size less than 10 nm, often have photoluminescence and unique optical properties. [192] When employing them to prepare hybrid aerogels, the excellent fluorescence activity can be well-retained, which can be selectively quenched by gases, [179] demonstrating a potential application in gas sensing.…”

Section: Gas Sensorsmentioning

confidence: 99%

“…[63] The chemical modification and introduction of heterostructure materials in the 3D graphene network have been proved to be efficient ways to prepare highperformance gas sensors. [62,137,191,193] For example, HSO 3 − with lone-pair electrons was used to modify the graphene sheets, and the resultant modified graphene network showed an enhanced selectivity of NO 2 due to the weak interaction between HSO 3 − and NO 2 . Through the density-functional calculation, Yuan and co-workers [217] theoretically simulated gas adsorption on the chemical modification of graphene with B-, N-, Al-, and Small 2019, 15,1902826 Reproduced with permission.…”

Section: Gas Sensorsmentioning

confidence: 99%

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Versatile Aerogels for Sensors

Yang

Zheng

et al. 2019

Small

119

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Aerogels are unique solid‐state materials composed of interconnected 3D solid networks and a large number of air‐filled pores. They extend the structural characteristics as well as physicochemical properties of nanoscale building blocks to macroscale, and integrate typical characteristics of aerogels, such as high porosity, large surface area, and low density, with specific properties of the various constituents. These features endow aerogels with high sensitivity, high selectivity, and fast response and recovery for sensing materials in sensors such as gas sensors, biosensors and strain and pressure sensors, among others. Considerable research efforts in recent years have been devoted to the development of aerogel‐based sensors and encouraging accomplishments have been achieved. Herein, groundbreaking advances in the preparation, classification, and physicochemical properties of aerogels and their sensing applications are presented. Moreover, the current challenges and some perspectives for the development of high‐performance aerogel‐based sensors are summarized.

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“…Therefore, after solvent removal, it forms a reduced graphene oxide (rGO) porous structure [7]. Currently, lots of research has been focused on the potential applications of rGO-based aerogels in energy storage systems (i.e., Li batteries [8–11], supercapacitors [12–16]), sensors (gas sensors [17–19], biosensors [20–21]) and adsorbers (oil pollution [22–23], organic contaminants [24–25]). Moreover, the properties of GO-based aerogels can be modified by addition of various functional additives, e.g., nanoparticles or polymers [26–29].…”

Section: Introductionmentioning

confidence: 99%

Anchoring Fe₃O₄ nanoparticles in a reduced graphene oxide aerogel matrix via polydopamine coating

Scheibe

Mrówczyński

Michalak

et al. 2018

Beilstein J. Nanotechnol.

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Reduced graphene oxide–magnetite hybrid aerogels attract great interest thanks to their potential applications, e.g., as magnetic actuators. However, the tendency of magnetite particles to migrate within the matrix and, ultimately, escape from the aerogel structure, remains a technological challenge. In this article we show that coating magnetite particles with polydopamine anchors them on graphene oxide defects, immobilizing the particles in the matrix and, at the same time, improving the aerogel structure. Polydopamine coating does not affect the magnetic properties of magnetite particles, making the fabricated materials promising for industrial applications.

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Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia

Cited by 40 publications

References 48 publications

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

Versatile Aerogels for Sensors

Anchoring Fe₃O₄ nanoparticles in a reduced graphene oxide aerogel matrix via polydopamine coating

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Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia

Cited by 40 publications

References 48 publications

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

Versatile Aerogels for Sensors

Anchoring Fe3O4 nanoparticles in a reduced graphene oxide aerogel matrix via polydopamine coating

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Anchoring Fe₃O₄ nanoparticles in a reduced graphene oxide aerogel matrix via polydopamine coating