Controllable synthesis of novel In₂O₃ nanostructures and their field emission properties

Abstract

Three kinds of novel indium oxide (In 2 O 3 ) nanostructures, namely, nanorods, nanoflowers and nanowhiskers were synthesized on silicon substrate via a simple vapor-phase transport method under atmospheric pressure. The In 2 O 3 nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectrometer (EDS) spectrum. The Raman spectra of these nanostructures showed four sharp scattering peaks centered at 308, 365, 522, and 628 cm -1 , whose position and intensity were characteristic of standard Raman spectra for In 2 O 3 . The Room-temperature photoluminescence (PL) spectra showed visible emissions centered around 576, 592, and 624 nm. Field emission measurements demonstrated that the nanoflowers possessed the best performance with a turn-on field of 3.54 V/µm and a threshold field of 9.83 V/µm. And the field enhancement factors of these nanostructures are high enough for the application of field emission display devices.

Manipulating the Defect Structure (VO) of In2O3 Nanoparticles for Enhancement of Formaldehyde Detection

“…According to the previous literature, the PL peaks at different wavelengths caused by different subgap energy levels of oxygen defects. , The blue-green (450–490 nm) emission peaks of In 2 O 3 result from the existence of singly ionized V O . ,, The singly ionized V O can serve as donors and induce to form new energy levels in the band gap. The radioactive recombination of the photoexcited hole and the electron occupying V O results in the emission. − The stronger blue-green emission peak indicates that there is more singly ionized V O in In 2 O 3 –H10. This result is consistent with the EPR result.…”

Fundamental nature and CO oxidation activities of indium oxide nanostructures: 1D-wires, 2D-plates, and 3D-cubes and donuts

“…11,22,47 The reported luminescence peak positions range from 340 nm to 640 nm, which depends on the preparation methods. 9,10,12,16,19,20,25,[47][48][49][50][51] Gan et al employed an electrodeposition method to prepare In 2 O 3 nanocubes deposited on a FTO glass, and observed a strong broad blue emission peak at 405 nm, attributed to singly ionized oxygen vacancies. 2 oxygen vacancies, respectively.…”

“…16 On the basis of literature, 9,10,12,16,19,20,25,[47][48][49][50] it can be concluded that the luminescence at longer (500-650 nm) wavelengths is due to deep oxygen vacancy energy levels of In 2 O 3 samples prepared by a physical vapor deposition. 16,50 For the In 2 O 3 prepared by a wet chemical method, photoluminescence appears between 400 and 500 nm, consistent with our results. 9,10,12,20,25,[47][48][49] Fig.…”

“…The luminescence peak of In 2 O 3 at different wavelengths has commonly been attributed to different subgap (deep or shallow) energy levels of various oxygen defects (or vacancies), where the electron in the vacancy recombines with a hole to emit a photon 11,22,47. The reported luminescence peak positions range from 340 nm to 640 nm, which depends on the preparation methods 9,10,12,16,19,20,25,[47][48][49][50][51]. Gan et al employed an electrodeposition method to prepare In 2 O 3 nanocubes deposited on a FTO glass, and observed a strong broad blue emission peak at 405 nm, attributed to singly ionized oxygen vacancies.2 Chun et al reported two broad peaks at 384 and 530 nm for In 2 O 3 nanobelts prepared by chemical vapor deposition, attributed to near band gap emission and…”

Facile synthesis of InGaZn mixed oxide nanorods for enhanced hydrogen production under visible light

“…The trap level emission is enhanced by low crystallinity and structural defects. 45,48,49 In order to compare the luminescence properties of all the photocatalysts, the PL emission spectra of all the photocatalysts are normalised and presented in Fig. S3.…”