One-step synthesis of high-quality homogenous Te/Se alloy nanorods with various morphologies

Abstract

A convenient method was developed for controllable synthesis of homogeneous trigonal Te/Se alloy nanorods (t-Te/Se ANRs) with diverse morphologies, aspect ratios and compositions at room temperature in aqueous solution. These alloy nanorods were formed by a self-seeding process. By varying the molar ratio of TeO 2 to H 2 SeO 3 IJxIJTe : Se)) in the initial precursors, the morphology of t-Te/Se ANRs was transformed mainly via two paths: formation of tri-fold nanorods (TNRs) or single nanorods (SNRs). The nanostructures of TNRs were generated only by using xIJTe : Se) ranging from 30 : 1 to 10 : 1, and SNRs were formed using xIJTe : Se) ranging from 200 : 1 to 100 : 1 or 2 : 1 to 1 : 1. The microstructures, compositions, and growth mechanisms of these nanorods were also analyzed in detail. Experimental section MaterialsTellurium dioxide (TeO 2 , Aladdin, 99.99%), selenious acid IJH 2 SeO 3 , Aladdin, 99.99%), sodium dodecyl sulfate (SDS, Aldrich, 99.99%) and hydrazine monohydrate IJN 2 H 4 ĴH 2 O, Sinopharm, 85%, AR) were used as-purchased. 18 MΩ cm CrystEngComm, 2015, 17, 3243-3250 | 3243 This journal is

Synthesis of Tellurium Fusiform Nanoarchitectures by Controlled Living Nanowire Modification

“…The decrease of the intensity shown in Figure 3b might be caused by the change of the structure. 33,[36][37][38] Overall, the analyses of XRD and Raman spectra were consistent with the changes of Te nanostructures from rod to fusiform. A number of empirical factors were investigated to confirm the interdependency of the CTAB and Te systems.…”

“…33 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 1b-c and Figure S2 clearly show the evolution of TeNRs to TeNFs. Moreover, the FESEM images embedded in the upper left corner in Figure 1a-c further confirm the above conclusions.…”

Environmentally benign synthesis of high-quality, band gap-tunable, homogeneous Te/Se alloyed nanowires

“…One commonly utilized solution-based synthesis method to fabricate metal t-Te/Se alloyed nanocrystal adopted hydrazine as the reducing agent 10,11,[13][14][15][16][17] , which is unfortunately explosive, pyrophoric, and carcinogenic. Hydroxylamine and sodium borohydride as alternative reducing agents are tolerable but still moderate hazardous [18][19][20] .…”

“…However, precise control of band gap in Te/Se nanowires is difficult since band gap normally changes irregularly with the increased Se percentage due to the poor morphology control of the alloys nanowire 11 . However, precise control of band gap in Te/Se nanowires is difficult since band gap normally changes irregularly with the increased Se percentage due to the poor morphology control of the alloys nanowire 11 .…”

“…Unlike previously reports 11 , the as-synthesized alloyed nanowires were determined as a single phase instead of a simple core-shell structure, which exhibited a continuously tunable band gap and could be used as photoconductivity and thermoelectric materials. The synthesis method used Te nanowires with different aspects ratio as sacrifice template.…”