Plasmon-enhanced photocatalytic and antibacterial activity of gold nanoparticles-decorated hematite nanostructures

Excellent photocatalytic degradation and antibiosis of WO3/Fe2O3 heterojunction

“…More precisely, after the photocatalytic antibiosis for 4 h, the sterilizing rate of 28.99% for WO 3 /Fe 2 O 3 composite film is 1.42 folds higher than that of 20.47% for bare WO 3 film. The enhanced antibacterial performances is attributed to two reasons as following [37]: (I) the introduction and dissolution of Fe 3+ with the deposition of Fe 2 O 3 , (II) the enhanced destruction for the mechanism of electrons transfer and the interrupt of respiration process for sulfur oxidizing bacteria due to the utilization of more photoinduced carriers with the formation of WO 3 /Fe 2 O 3 heterojunction.…”

Anti-bacterial activity of gold nanocomposites as a new nanomaterial weapon to combat photogenic agents: recent advances and challenges

“…In this work, nanostructures were decorated equally with gold nanoparticles to improve their optical activity in visible-light illumination. 88 This nding indicated that AgNPs possess high antibacterial activity only against E. coli. Whereas, AuNPs display only slight antibacterial activity against S. aureus and E. coli.…”

Görünür-Işık ile Çalışan Fotokatalizör Hematitin Çinko ve Bakır ile Katkılanmasıyla Geliştirilmesinin Karşılaştırmalı İncelenmesi

“…The exponent n is a constant relating to the electronic transition type. In that study, the band type of hematite was taken into account as a direct allowed transition for determining its optical band gap value due to the fact that studies published in the literature [26,10] report that hematite had a direct allowed transition. For this reason, the optical bandgaps of produced powders were determined from the plot of hν vs. (F(R)hν) 2 through extrapolating the straight portion to the energy axis at α=0 in figure 4b and figure 4d.…”

“…It suffers from poor electrical conductivity (8x10 -6 -2x10 -4 Ω -1 cm -1 ) [3], short hole-diffusion length (2-4 nm) [3], low carrier mobility (< 1 cm 2 V -1 s -1 ) [4], low absorptivity (120 nm λ=550 nm) [5] and a very short excited-state lifetime (10 -12 s) [6]. To overcome these shortcomings, there are various methods such as manipulation of morphological features [7,8], surface treatments [9], plasmonic effects [10], and incorporation of dopants [11,12]. These mentioned inherent disadvantages of hematite semiconductors give rise to diminishing their photoactivity.…”