One-step synthesis of multi-modal pore systems in mesoporous In2O3: A detailed study

Klaus, Dominik; Amrehn, Sabrina; Tiemann, Michael; Wagner, Thorsten

doi:10.1016/j.micromeso.2014.01.007

Cited by 13 publications

(7 citation statements)

References 27 publications

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“…Moreover, owing to the low melting temperature of the blend, the precursors can (3) easily infiltrate the pores of a silica structure matrix in large quantities in a single step. The utilization of precursor melts has been shown to be beneficial on various occasions as they generally provide an enhanced impregnation efficiency 10,29,41–45. As mentioned above, conventional infiltration procedures are usually either based on aqueous solutions of precursor compounds (e.g., sucrose) and require consecutive cycles of impregnation/conversion or rely on toxic precursors such as furfuryl alcohol.…”

Section: Introductionmentioning

confidence: 99%

Fructose and Urea as Precursors for N‐/O‐Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions

et al. 2014

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Ordered mesoporous carbon with a high heteroatom (N, O) content was prepared by nanocasting from a melt of a eutectic mixture of fructose and urea (60/40 wt.‐%; melting temperature ca. 65 °C). These precursor compounds are cheap and environmentally friendly. The material possesses enhanced pore‐wall surface polarity as compared to that of mesoporous carbon prepared by the same technique without urea. This was verified by water sorption analysis. As a result, the heteroatom‐modified material shows higher sorption capacity for the uptake of heavy metal ions (Cu2+) from aqueous solution, which may be interesting for potential application in wastewater cleaning.

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Section: Introductionmentioning

confidence: 99%

Fructose and Urea as Precursors for N‐/O‐Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions

et al. 2014

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“…This explained why MLHOs had pores of 8-10 nm size; this is equivalent to the dimension of two walls and a pore of KIT-6. 38,39 Thus, the MLHOs from KIT-6-35C had a more distinct bimodal pore distribution relative to those from KIT-6-100C owing to less lling of La precursor into the mesopores in the KIT-6-35C matrix. Interestingly, the isotherms of MLHO-100Cs showed a hysteresis loop at a high relative pressure (P/P 0 > 0.9), suggesting the presence of macroporosity.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of mesoporous lanthanum hydroxide with enhanced adsorption performance for phosphate removal

Kim

et al. 2019

RSC Adv.

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“…However, the peaks of gas‐sensing materials barely occur at the same degree indicating the ordered structures were destructed. This could be explained by the following considerations: The template might be twisted or wrecked due to the grain growth during heat treatment and a small amount of precursor is not resident inside the pores during the impregnation step . For the pure LFO, small diffraction peaks at 2θ values of 22.61, 32.19, 39.67, 46.14, 57.40, 67.35, and 76.64 which are assigned to the (1 0 1), (1 2 1), (2 2 0), (2 0 2), (2 4 0), (2 4 2), and (2 0 4) diffractions, respectively, which are in accordance with orthorhombic LFO (JCPDS#37‐1493) with perovskite structure.…”

Section: Resultsmentioning

confidence: 99%

Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO₃ Nanocomposite

Chen

Wang

et al. 2018

Adv Materials Inter

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detecting ethanol along with response of 53 (50 ppm) at 275 °C. [6] Mesoscale porosity makes a significant contribution to obtaining high response in MOS because of the facile penetration of gas molecules. [7] A number of efforts have been made to synthesize mesoporous materials, [8][9][10][11] one of which involved the nanocast mesostructured metal oxides synthesized by hard template. Compared to soft template and sacrificial colloidal template methods, the hard template can provide a relatively stable matrix during heat treatment over a larger temperature range, as a result, it helps MOS show higher crystallinity. [12] Recently, it has been reported that hetero nanostructures consisting of two or more components with noble metals decorated can improve the sensing performance. [13,14] To improve the gas sensing performance of metal oxides, noble metals, such as Ag, Pd, Pt, and Au are commonly regarded as catalyst, especially, Ag is able to weaken the adsorption and the desorption energy of ethanol molecules on the surface by promoting the electron conduction properties, [15] thus it enables the analyte to access the activated surface. Perovskite type (ABO 3 , where A is rare earth and B is transition metal) MOS have attracted considerable attentions in applications of catalysis, [16] renewable energy storage, [17] and gas sensors [18] due to their numerous favorable physical/chemical properties. Among various perovskite type materials, LaFeO 3 shows considerably sensitive to reducing gases such as ethanol, [19] acetone, [20] and formaldehyde. [21] However, pure LaFeO 3 have some deficiencies such as high resistance, high working temperature, and poor selectivity. Ag/LaFeO 3 has been investigated to detect VOCs at low temperature (<200 °C) according to our previous work. Zhang et al. reported Ag/LaFeO 3 showed excellent gassensing properties to formaldehyde gas. At the optimal working temperature of 90 °C, the response of the sensor to 1 ppm formaldehyde is 25. [22] In addition, it was reported that the substitution of La 3+ in the LaFeO 3 compound by the lower-valent cations, such as Mg 2+ , [23] Ba 2+ , [24] Ca 2+ , [25] Sr 2+ , [26] and Pb 2+ , [27] could significantly improve gas sensing properties of materials, especially gas response and selectivity.In this study, mesoporous Ag/Zn-LaFeO 3 nanocomposites have been synthesized via a simple nanocasting technique shown in Figure 1. This kind of composite not only possesses a highly active and large surface area for ethanol recognition,The rational design of heterojunction between different metal oxides with mesoporous structures has attracted tremendous attention due to their special physicochemical properties and vital importance for practical applications. In this paper, mesoporous Ag/Zn-LaFeO 3 nanocomposite is successfully synthesized through a facile nanocasting technique using KIT-6 as a hard template in sol-gel route and used as sensing materials to achieve an exceptionally sensitive and selective detection of trace ppm-level ethanol. The obtained compos...

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One-step synthesis of multi-modal pore systems in mesoporous In2O3: A detailed study

Cited by 13 publications

References 27 publications

Fructose and Urea as Precursors for N‐/O‐Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions

Fructose and Urea as Precursors for N‐/O‐Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions

Synthesis of mesoporous lanthanum hydroxide with enhanced adsorption performance for phosphate removal

Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO₃ Nanocomposite

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One-step synthesis of multi-modal pore systems in mesoporous In2O3: A detailed study

Cited by 13 publications

References 27 publications

Fructose and Urea as Precursors for N‐/O‐Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions

Fructose and Urea as Precursors for N‐/O‐Modified Mesoporous Carbon with Enhanced Sorption Capacity for Heavy Metal Ions

Synthesis of mesoporous lanthanum hydroxide with enhanced adsorption performance for phosphate removal

Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO3 Nanocomposite

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Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO₃ Nanocomposite