Solvent dependence of laser-synthesized blue-emitting Si nanoparticles: Size, quantum yield, and aging performance

Si nanocrystal solution with stability for one year

“…where V R and V A are repulsive and attractive energies, respectively, A the Hamaker constant; 95-98 a the SiNCs radius; 31,54 x the distance between two SiNCs surfaces; z the z-potential; exp(Àkx) approximately unity at no electrolyte. 94 According to the results in Fig.…”

“…58 To this end, production of Si nanocrystals (SiNCs) by PLAL has been investigated in various liquids (Table S1, ESI †), and a clear colour and stability for a period of at least forty days were observed in alcohol. 34,39,54 Therefore, passivated SiNCs have been synthesized by PLAL in alkyl, halide, and aromatic Scheme 1 Illustration of PLAL to generate SiNCs.…”

“…33,44 Because Si is a bioinert, abundant, and cost-effective material, [59][60][61][62] colloidal SiNPs have been used to develop solar cells, 63 light emitters, 64 on-skin sensors, 65 and Li-ion batteries 66 via solution processes. [67][68][69][70][71][72][73][74][75][76] In a previous study, we synthesized SiNCs using the two different methods of PLA 30,35,42,44,46,47,54 and ball milling, 77 both of which are mechano-synthesis methods. We note that the SiNCs prepared by ball milling in isopropyl alcohol (IPA) showed notably long-term (4 months) stability, which is attributed to their large z-potential.…”

A novel and facile synthesis of visible photoluminescence Si nanocrystals by room temperature mechanochemical disproportionation of SiO

“…Si nanocrystals (NCs) have attracted much attention as promising materials for optoelectronic devices, photovoltaics, and in vivo bio-imaging based on their broadly size-tunable bandgap due to quantum connement effects, natural abundance, non-toxicity and good biodegradability. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] As for optoelectronic devices, Maier-Flaig et al 3 and Xin et al 4 developed Si NC light-emitting diodes giving electroluminescence in red and white-blue wavelengths, respectively, whose research provides a new opportunity for next-generation solid-state lighting and large-area display technology. Tan and Ni et al 5 developed broadband (from the ultraviolet to near-infrared region) optoelectronic synaptic devices by utilizing Si NCs that can help advance neuromorphic computing.…”

“…8 Numerous syntheses of photoluminescent Si NCs have been reported, which can be divided into top-down and bottom-up approaches. In the case of top-down approaches, laser ablation of Si wafer, 9 electrochemical etching of Si 10 and mechanochemical ball-milling of bulk Si 11 have been demonstrated. As for bottom-up approaches, Si NCs have been synthesized via the plasma decomposition of silane, 12 chemical reduction of tetrachloride silane, 13 thermal pyrolysis of hydrogen silsesquioxane, 14 and thermal disproportionation of SiO x (1 < x < 2).…”