The gallium-based eutectic alloy has gained particular attention in various fields due to its natural fea-tures of metallic fluids at room temperature.However,these alloy nanoparticles are extremely susceptible to be oxidized accompanied by de-alloying during the preparation,storage,and application.Here,with the assistance of the macromolecular stabilizer and dopant,sodium dodecylbenzene sulfonate(SDBS),we demonstrate a stable polypyrrole(PPy)layer acts as a protected"armor"on the surface of liquid metal(i.e.,gallium-tin,EGaSn).SDBS enables the EGaSn to keep well dispersion and protects dispersed EGaSn from being durative oxidized before PPy coating.Furthermore,PPy greatly inhibits the oxidation of EGaSn owing to the strong interface interaction between the lone pair electrons around the N atoms of Py rings and the Ga3+orbit of EGaSn.Consequently,the fabricated EGaSn nanoparticles possess the features of smaller particle size,superior uniform distribution,and stronger antioxidant capacity.The prepared EGaSn@PPy composite exhibits superior stability even after storing in an aqueous solution for up to 100 days.As a proof-of-concept application,the EGaSn@PPPy composite displays remarkable pho-tothermal performance with an enhanced photothermal conversion efficiency.This work provides a novel surface engineering strategy to ameliorate liquid metal for photothermal therapy applications.

Yaqin Qi;Ting Jin;Kai Yuan;Jingyuan You;Chao Shen;Keyu Xie

State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engineering,Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU),Xi'an 710072,China;Research&Development Institute of Northwestern Polytechnical University in Shenzhen,Northwestern Polytechnical University,Shenzhen 518057,China

材料科学技术（英文版）

[1]Yaqin Qi;Ting Jin;Kai Yuan;Jingyuan You;Chao Shen;Keyu Xie-.Chemically stable polypyrrole-modified liquid metal nanoparticles with the promising photothermal conversion capability)[J].材料科学技术（英文版）,2022(32):144-152

EGaSn,durative,Ga3+orbit,PPPy

Chemically,stable,polypyrrole,modified,liquid,nanoparticles,promising,photothermal,conversion,capability,gallium,eutectic,has,gained,particular,attention,various,fields,due,natural,metallic,fluids,room,temperature,However,these,extremely,susceptible,oxidized,accompanied,by,alloying,during,preparation,storage,Here,assistance,macromolecular,stabilizer,dopant,sodium,dodecylbenzene,sulfonate,SDBS,demonstrate,layer,acts,protected,armor,surface,enables,keep,well,dispersion,protects,dispersed,from,being,before,coating,Furthermore,greatly,inhibits,oxidation,owing,interface,interaction,between,lone,pair,electrons,around,atoms,rings,Consequently,fabricated,possess,features,smaller,size,superior,uniform,distribution,stronger,antioxidant,capacity,prepared,composite,exhibits,stability,even,after,storing,aqueous,solution,days,proof,concept,displays,remarkable,performance,enhanced,efficiency,This,work,provides,novel,engineering,strategy,ameliorate,therapy,applications

0.564762