Orientation of tungsten trioxide thin films fabricated by sol–gel method using aqueous sols of colloidal layered tungstates

Hydrothermal Synthesis of Layered Perovskite-Structured Metal Oxides and Cesium Tungstate Nanosheets

“…Since tungstic acid is more acidic than niobic acid, layered cesium tungstates are likely to be synthesized successfully in acid or neutral solutions. Previously, we reported on the synthesis of layered alkylammonium tungstates by mixing H 2 WO 4 and alkylamines NH 2 C n H 2 n +1 ( n = 2–12) at an N/W ratio of 1 . In this study, layered tungstates were prepared using alkylamines NH 2 C n H 2 n +1 ( n = 4–12) in the same way as done in the previous study .…”

“…Previously, we reported on the synthesis of layered alkylammonium tungstates by mixing H 2 WO 4 and alkylamines NH 2 C n H 2n+1 (n = 2−12) at an N/W ratio of 1. 41 In this study, layered tungstates were prepared using alkylamines NH 2 C n H 2n+1 (n = 4−12) in the same way as done in the previous study. 41 Then, CsOH was added to the suspensions.…”

“…41 In this study, layered tungstates were prepared using alkylamines NH 2 C n H 2n+1 (n = 4−12) in the same way as done in the previous study. 41 Then, CsOH was added to the suspensions. The mixtures were hydrothermally treated at 100 °C, 150 °C, and 200 °C, to induce reaction of tungstate layers to Cs + .…”

Bottom-up synthesis of titanophosphate nanosheets by the aqueous solution process

“…These layered metalates are exfoliated, yielding metalate nanosheets as highly water-dispersible colloidal particles, which can be applied as coating sols for thin lm fabrication by solution processes. 13,19 In our previous work, many types of metalate nanosheets were synthesized in strongly basic aqueous sols, which can corrode the substrates. To avoid this problem, bottom-up synthesis of metalate nanosheets in acidic or neutral aqueous sols is desirable.…”