From spindle-like β-FeOOH nanoparticles to α-Fe2O3 polyhedral crystals: shape evolution, growth mechanism and gas sensing property

Eco-friendly synthesis and photodegradation of hierarchical nanostructures of β-FeOOH and α-Fe2O3

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Hierarchical nanostructures β-FeOOH and α-Fe 2 O 3 with different morphology were successfully synthesized via a facile and green hydrolysis-aging method using urea or saccharide as organic matrix. Likewise, β-FeOOH has attracted much attention because of its channel-type nanoporous structure and unique sorption, ion exchange, and catalytic properties [31][32][33][34] . Systematic control on the morphology and microstructure of the products was achieved by regulating the aging time and the concentration of organic matrix.

The amount of saccharide was very important in stabilizing metastable β-FeOOH.

The formation mechanism of various morphologies and the cause of stabilizing β-FeOOH were tentatively proposed on the basis of the evolution of the structure and the morphology, along with variation of the reactive conditions.

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“…Likewise, β-FeOOH has attracted much attention because of its channel-type nanoporous structure and unique sorption, ion exchange, and catalytic properties [31][32][33][34] . Likewise, β-FeOOH has attracted much attention because of its channel-type nanoporous structure and unique sorption, ion exchange, and catalytic properties [31][32][33][34] .…”

A high performance methanol gas sensor based on palladium-platinum-In2O3 composited nanocrystalline SnO2

“…A comparison between the sensing performances of the sensor and the literature reports is summarized in Table 2. As has been shown, there are various gas sensing materials were used to detect methanol gas [11,21,22,25,33,34,[36][37][38][39][40][41][42][43][44][45], including n-type and p-type oxide semiconductors, such as porous In 2 O 3 nanobelts [36], SnO 2 inverse opal [21], WO 3 particles [43], CuO thin film [45] and so on. However, the gas response values of these materials toward methanol are all poor, and the operating temperatures are quite high.…”

PVP-assisted synthesis of flower-like hematite microstructures composed of porous nanosheets

“…It is well known that the morphology and size of a-Fe 2 O 3 show strong effects on their varying chemical and physical properties. Considerable efforts have been devoted to the synthesis of a-Fe 2 O 3 with various shapes so far [10][11][12][13][14][15][16][17][18]. Typically, porous Fe 2 O 3 nanocubes composed of fine Fe 2 O 3 nanoparticles were synthesized by simultaneous oxidative decomposition of Prussian blue nanocubes at high temperature, and these Fe 2 O 3 nanocubes showed high specific capacity (*800 mA h g -1 at 200 mA g -1 ) and excellent cycling performance [11].…”