Composition-Dependent Aspect Ratio and Photoconductivity of Ternary (Bi_xSb_1–x)₂S₃ Nanorods

Abstract

The chemical composition, size and shape, and surface engineering play key roles in the performance of electronic, optoelectronic, and energy devices. VVI (V = Sb, Bi; VI = S, Se) group materials are actively studied in these fields. In this paper, we introduce a colloidal method to synthesize uniform ternary (BiSb)S (0 < x < 1) nanorods. These nanorods show composition-dependent aspect ratios, enabling their composition, size, and shape control by varying Bi/Sb precursor ratios. It is found that the surface passivation by various thiols (L-SH) efficiently enhances the photoconductivity and optical responsive capability of (BiSb)S nanorods when used as active materials in indium tin oxide (ITO)/(BiSb)S/ITO optoelectronic devices. Meanwhile, the increase of Sb content causes a gradual deterioration of photoconductivity of thiol-passivated nanorods. We propose that the thiol passivation is able to reduce the number of S vacancies, which act as the recombination centers (trapped states) for photogenerated electrons and holes, and thus boosts the carrier transport in (BiSb)S nanorods, and in particular that the composition-related conductivity deterioration is attributed to the increase of unpassivated S vacancies and surface oxidation due to the rise of Sb content.

Templated Synthesis of Nickel−Iron Layered Double Hydroxide for Enhanced Electrocatalytic Water Oxidation: Towards the Development of Non‐Precious‐Metal Catalysts

“…[1][2][3][4][5][6][7][8][9] Oxygen evolution reaction (OER) is the process of generating oxygen through electrolysis of water and it holds a key for many energy storage options such as water splitting, rechargeable metal-air batteries and solar cells. [1][2][3][4][5][6][7][8][9] Presently, the most effective OER catalysts are precious metals (like Pt, Ru and Ir) and their oxides in acidic and/or alkaline solutions. [10] These precious metal oxides suffer from scarcity, high cost and poor stability in alkaline solution so that it becomes impractical to use them on a large scale.…”

Interfacial N→Sb Nonbonded Interaction Enhances the Photoelectronic Performance of PVP‐Capped Sb2S3 Amorphous Colloids

“…Only Sb, S, N, and C elements are detectable in the survey spectra of XPS (Figure S8), indicating the high purity of all samples. As revealed in Figure S8, the binding energy (BE) values of Sb 3d core level are in good agreements with trivalent Sb 3+ from Sb 2 S 3 ;,, the use of N 2 H 4 prevents the surface oxidation of Sb 2 S 3 samples, for there is no detectable XPS signal of Sb 3d from Sb−O species ,. Especially, the N 1s signals (Figure ) can be detected for all of the Sb 2 S 3 samples that were prepared in the presence of PVP, but not detected for that prepared without PVP, although other reagents containing N element (i. e., N 2 H 4 and ethanolamine) were also employed in the synthetic experiments.…”

“…Different from PVP, DT can promote the crystallization of a‐Sb 2 S 3 . The SH groups in DT offer a sulfur‐rich local circumstance and thus facilitate the transformation of amorphous to crystalline Sb 2 S 3 . This can explain why the addition of DT in the later period of synthesis produced the a‐Sb 2 S 3 +c‐Sb 2 S 3 mixture.…”

“…The photoelectronic devices made of Sb 2 S 3 samples were fabricated on ITO‐coated glass substrates in a typically sandwiched ITO/Sb 2 S 3 /ITO structure . The resistance of ITO conductive film is 15 Ω. ITO substrate was cleaned ultrasonically using acetone and ethanol and then dried before use in the device fabrication.…”

Rational Design of Electrochemical DNA Biosensors for Point‐of‐Care Applications

“…The Exo III then digested the capture probe releasing the methylene blue to the solution, thereby decreasing the electrochemical signal. [59] This strategy was reported to have an LOD of 30 aM in 60 minutes. It has a comparable detection limit to self-assembly based reactions with several DNA probes (section 2.2.1) even if it required a shorter assay time.…”